28/11/2010 Richard Kapek proves 220698!12-1 (digits: 90296) prime
25/11/2010 Rene Dohmen proves 330925!7-1 (digits: 240417) prime (new multifactorial record) 14/10/2010 Richard Kapek's recent
spate of primes completes the original aims, as established in
2003, of this project these being to find all primes of the form
n!k+/-1 where 2<=k<=25
I see no reason for terminating the
project so I have set a new aim.
11/11/2010 Michael Lau proves 494306!23+1 (digits: 112795) prime
05/11/2010 Matt Mills proves 255613!23-1 (digits: 55274) prime
20/10/2010 Matt Mills Statistical table showing by searcher - the number of primes (with greater than 10000 digits) discovered along with the average size of
those primes and their largest prime incorporated into the site
07/11/2010 Michael Lau proves 500110!23+1 (digits: 114480) prime
14/10/2010 Richard Kapek proves 181800!15-1 (digits: 58486), 204430!16+1 (digits: 62306), 194968!17-1 (digits: 55691), 195258!17-1 (digits: 55782), 207816!17+1 (digits: 59700) and 263374!18+1 (digits: 72962) prime
04/10/2010 Richard Kapek proves 154069!15+1 (digits: 48827), 156553!15+1 (digits: 49686), 164210!15+1 (digits: 52344), and 169786!15+1 (digits: 54285) prime
13/09/2010 Matt Mills proves 240322!23-1 (digits: 51688), and 241742!23-1 (digits: 52021) prime
08/09/2010 Richard Kapek proves 167328!16-1 (digits: 50089), 166316!16+1 (digits: 49759), 207942!18-1 (digits: 56421), and 180962!18+1 (digits: 48494) prime
06/09/2010 Ken Davis finishes !9 to 110000 and proves 107384!9+1 (digits: 54848), 107938+9+1 (digits: 55158) and 108265!9+1 (digits:55341) prime
31/08/2010 Rene Dohmen proves 278738!7+1 (digits: 199536) prime
29/08/2010 Richard Kapek proves 142036!12+1 (digits: 55848), 148614!12+1 (digits: 58678), 237498!22+1 (digits: 53347), 238234!22-1 (digits: 53427), 253880!25+1 (digits: 50478), 254291!25+1 (digits: 50567), 256530!25+1 (digits: 51051), 257839!25+1 (digits: 51334) and 258852!25-1 (digits: 51554) prime
23/08/2010 Michael Lau proves 468661!23+1 (digits: 106707) and 470469!23+1(digits: 107152) prime
20/08/2010 Richard Kapek completes !19-1 to 220000, !21-1 to 280000, !24+1 to 300000 and proves 218492!19-1 (digits: 56410), 273983!21-1 (digits: 65282) and 282718!24+1 (digits: 59104) prime
16/08/2010 Ken Davis proves 101129!9-1 (digits: 51361) prime
09/08/2010 Richard Kapek completes !21- to 250000, !24- to 300000, and proves 235416!21-1 (digits: 55355) and 296606!24-1 (digits: 62264) prime
03/08/2010 Richard Kapek completes !24+ to 260000, !14+ to 200000, !12- to 210000 and proves 177096!14+1 (digits: 60898) and 209898!12-1 (digits: 85497) prime
29/07/2010 Richard Kapek completes !12- to 200000, !24- to 260000, !24+ to 250000, proves 247674!24+1 (digits: 51185) prime and reserves !21-
26/07/2010 Richard Kapek completes !14+ to 170000
23/07/2010 Richard Kapek proves 156482!14+1 (digits: 53209) prime
22/07/2010 Richard Kapek completes !12-1 to 180000 & !14+1 to 150000
23/07/2010 Richard Kapek proves 156482!14+1 (digits: 53209) prime
22/07/2010 Richard Kapek completes !12-1 to 180000 & !14+1 to 150000
19/07/2010 Richard Kapek reserves !14 & !24+/-
08/07/2010 Richard Kapek finishes !12-1 to 160000
27/05/2010 Rene Dohmen proves 284400!7+1 (digits: 203944) prime (new multifactorial record)
15/04/2010 Rene Dohmen proves 234676!7+1 (digits: 165489) prime (new multifactorial record)
10/04/2010 Michael Lau proves 419499!23+1, 431414!23+1 and 432801!23+1 (digits:97892) prime
07/02/2010 Michael Lau proves 417240!23+1 (digits: 94083) prime
28/01/2010 Matt Mills finishes !23-1 to 230000 finding 9 additional primes including 229345!23-1 (digits: 49125)
18/01/2010 Ken Davis finishes !22-1 to 220000 ==> all types complete up to 10000*type
07/01/2010 Matt Mills Proves 171232!23-1 (digits: 35733), 172344!23-1 (digits: 35986) and 177871!23-1(digits: 37246) prime
01/01/2010 Matt Mills proves 166332!23-1 (digits: 34619) prime
31/12/2009 Matt Mills proves 200379!23-1 (digits: 42410) prime
23/12/2009 Matt Mills reserves !23-1 type
26/09/2009 Rene Dohmen proves 208502!7+1 (digits: 145502) prime (new multifactorial record)
31/08/2009 Rene Dohmen proves 190453!7-1 (digits: 131837) and 206494!7+1 (digits: 143977) prime
14/08/2009 Michael Lau proves 382722!23+1 (digits: 85676) prime
15/06/2009 Rene Dohmen proves 196304!7+1 (digits: 136256) and 199071!7+1 (digits: 138349) prime
06/06/2009 Matt Mills completes !10+/-1 to 120000
02/06/2009 Michael Lau proves 326910!23+1 (digits: 72210) and 336012!23+1 (digits: 74394) prime
17/05/2009 Ken Davis finishes !13 to 150000
05/05/2009 Michael Lau proves 311995!23+1 (digits: 68640) prime
08/04/2009 Michael Lau proves 262949!23+1 (digits: 57001), 268256!23+1 (digits: 58253) and 289137!23+1 (digits: 63196) prime
08/03/2009 Matt Mills proves 108650!10-1 (digits: 50001) and 108754!10-1 (digits: 50053) prime
14/02/2009 Matt Mills proves 107390!10+1 (digits: 49367) and 107552!10+1 (digits: 49448) prime
02/02/2009 Michael Lau proves 248570!23+1 (digits: 53621), 249154!23+1 (digits: 53757), 52538!23+1 (digits: 54552) and 261973!23+1 (digits: 56771) prime
26/01/2009 Ken Davis proves 131023!13-1 (digits: 47202) and 133152!13-1 (digits: 48041) prime
08/01/2009 Michael Lau proves 229137!23+1 (digits: 49077) and 240834!23+1 (digits: 51808) prime
02/01/2009 Matt Mills completes !25-1 to 250000
28/12/2008 Matt Mills proves 239318!25-1 (digits: 47337) prime
24/12/2008 Matt Mills proves 231110!25-1 (digits: 45574) prime
19/12/2008 Matt Mills proves 228772!25-1 (digits: 45072) prime
19/12/2008 Matt Mills finishes !24-1 to 240000 and starts !25-1
18/12/2008 Matt Mills proves 236040!24-1 (digits: 48575) prime
13/11/2008 Rene Dohmen proves 168450!7-1 (digits: 115324) prime
15/10/2008 Matt Mills reserves !24-1
08/07/2008 Jason Fraser proves 195496!22-1 (digits: 43162) prime
30/05/2008 Andrea Pacini completes !3-1 to 110000
10/05/2008 Don Routman finishes !4+/-1 range (10000-120000)
30/05/2008 Andrea Pacini completes !3-1 to 110000
10/05/2008 Don Routman finishes !4+/-1 range (10000-120000)
09/05/2008 Rene Dohmen proves 159251!7+1 (digits: 108471) and 160393!7+1 (digits: 109320) prime
04/05/2008 Ken Davis proves 275259!11-1 (digits: 125257) prime
15/04/2008 Jason Fraser proves 164642!22-1 (digits: 35792) prime
03/04/2008 Ken Davis proves 272980!11-1 (digits: 124131) prime
02/04/2008 Ken Davis proves 272910!11+1 (digits: 124096) prime
27/03/2008 Jason Fraser finishes 25!+1 to 250000 and reserves !22-1
30/01/2008 Jason Fraser proves 235349!25+1 (digits: 46484)and 235979!25+1 (digits: 46619) prime
25/01/2008 Michael Lau proves 215387!23+1 (digits: 45880) and 227868!23+1 (digits: 48781) prime
23/01/2008 Rene Dohmen proves 142780!7+1 (digits: 96285) prime
20/01/2008 Hugo Platzer reserves !23-1
08/01/2008 Andrea Pacini reserves !3-1 (100000-110000)
29/12/2007 Jason Fraser proves 221378!25+1 (digits: 43489) and 225086!25+1 (digits: 44283) prime
21/12/2007 Michael Lau completes !23+1 to 200000 - largest prime 198422!23+1 (digits: 41959)
28/11/2007 Jason Fraser reserves !25+1
31/10/2007 Rene Dohmen proves 127284!7+1 (digits: 84929) prime
20/09/2007 Rene Dohmen proves 113888!7+1 (digits: 75205) prime
02/09/2007 Don Routman joins search and reserves !4+/-1
26/04/2007 Jason Fraser finishes !21+1 to 210000
23/04/2007 Rene Dohmen Proves 132058!7+1 (digits: 88415) prime
11/04/2007 Steven Harvey finishes !4 +/-1 to 100000
03/04/2007 Hugo Platzer proves 2935!6-2 prime
01/04/2007 Hugo Platzer proves 2697!6-2, 2890!6-2 and 2863!6-2 prime
21/03/2007 Matthew Peets proves 1633!6-2, 1821!6-2 and 2259!6-2 prime
19/03/2007 Ken Davis proves 197567!11+1 (digits:87317) prime
26/02/2007 Ken Davis finishes !6-1 to 100000
13/02/2007 Ken Davis proves 84510!6-1 (digits:63281)and 86022!6-1 (digits:64524) prime
26/01/2007 Ken Davis proves 195439!11+1 (digits:86293) prime
22/01/2007 Michael Lau proves 145053!23+1 (digits:29816) and 145223!23+1 (digits:29854) prime
09/01/2007 Ian Brown finishes !7+1 to 100000 and proves 73826, 79379 and 87239!7+1 (digits:56165) prime
06/12/2006 Ken Davis finishes !2-1 to 100000
05/11//2006 Ken Davis proves 189929!11+1 (digits:83646) prime
31/10/2006 Ken Davis proves 225562!11+1 (digits100870) prime
28/10/2006 Michael Lau proves 128752!23+1 (digits:26176) prime
25/10/2006 Steven Harvey proves 54406!4+1 (digits 58508) prime
14/10/2006 Michael Lau proves 126831!23+1 (digits:25750) prime
07/10/2006 Ken Davis proves 221725!11+1 (digits:99004) prime
19/09/2006 Steven Harvey finishes !3+1 to 100000
18/09/2006 Jason Fraser proves 180246!21-1 (digits:41387) prime
06/09/2006 Steven Harvey proves 95493!3+1 (digits:144697) prime (new record multifactorial)
15/08/2006 Ken Davis proves 210666!11+1 (digits:93641) prime
03/08/2006 Michael Lau proves 118806!23+1 (digits:23974) prime
28/07/2006 Michael Lau proves 117481!23+1 (digits:23681) and 117743!23+1 (digits:23739) prime
20/07/2006 Michael Lau proves 113997!23+1 (digits:22915) prime
25/06/2006 Ken Davis proves 202419!11+1 (digits:89656) prime
30/05/2006 Jason Fraser finishes !22+1 to 220000 in the process finding: 183564!22+1 (digits:40299),
186318!22+1 (digits:40959), 189968!22+1 (digits:41834) and 213758!22+1 (digits:47541)
17/04/2006 Ronny Edler completes !25 to 210000 in the process finding 202633!25-1 (digits:39496)
and 207131!25+1 (digits:40451)
31/03/2006 Steven Harvey proves 80069!3+1 (digits:119284) prime (new record multifactorial)
19/03/2006 Ken Davis proves 164892!11+1 (digits:71700) prime
28/02/2006 Jason Fraser finishes !24+1 to 240000 and reserves !22+1
21/02/2006 Jason Fraser proves 226208!24+1 (digits:46378), 227194!24+1 (digits:46598)
and 229204!24+1 (digits:47047) prime
07/02/2006 Jason Fraser proves 217560!24+1 (digits:44451) prime
20/01/2006 Jason Fraser proves 178966!24+1 (digits:35934) and 192320!24+1 (digits:38866) prime
20/12/2005 Steven Harvey finishes 3!+1 to 75000
06/12/2005 Ken Davis proves 133160!11+1 (digits:56779) and 133470!11+1(digits:56923) prime
26/11/2005 All types up to 20 now tested to 10000*type+/-1
26/11/2005 Ken Davis finishes !15 to 150000 in the process proving 135965!15-1 (digits:42598),
139671!15+1 (digits:43867) and 146418!15-1 (digits:46186) prime
16/11/2005 Cedric Vonck joins search and reserves !4+1
31/10/2005 Masataka Oita proves 211158!21+1 (digits:49176) & 212048!21+1 (digits:49402) prime
09/09/2005 Matt Mills finishes !15 to 130000
06/09/2005 Jason Fraser proves 200329!21+1 prime (digits:46436)
24/08/2005 Jason Fraser proves 199047!21+1 prime (digits:46113)
21/08/2005 Ronny Edler finishes !25 to 200000 in the process proving 197905!25-1 (digits:38493) prime
06/08/2005 Ken Davis finishes !17-1 to 170000
12/07/2005 Steven Harvey reserves !3+1
31/05/2005 Ken Davis finishes !17+1 to 170000
21/05/2005 Ken Davis proves 166614!17+1 prime (digits:46924)
27/04/2005 Matt Mills proves 110972!15-1 prime (digits:34115)
25/04/2005 Matt Mills proves 110167!15+1 prime (digits:33845)
22/04/2005 Matt Mills proves 109118!15-1 prime (digits:33492)
15/04/2005 Matt Mills proves 106195!15+1 prime (digits:32512)
29/03/2005 Mark Rodenkirch finishes !19 to 200000 in the process proving 195712!19+1 (digits:50037) prime
06/03/2005 Yahoo deactivated my kraDen(at)yahoo(dot)com(dot)au address (why??)
26/02/2005 Ronny Edler finishes !25 to 190000
09/01/2005 Mark Rodenkirch reserves !19
04/01/2005 David Kokales finishes !6+1 to 100000
26/12/2004 David Kokales and Ian Brown combine to prove 99088!6+1 (digits:75339) prime
23/12/2004 Mark Rodenkirch completes !3-1 to 100000
23/11/2004 David Kokales and Ian Brown combine to prove 94412!6+1 (digits:71453) prime
18/11/2004 Ken Davis finishes !11-1 to 250000
16/11/2004 Michael Lau finishes !23 to 100000
31/10/2004 Ronny Edler finishes !25 to 180000 in the process proving 162986!25+1 (digits:31152) prime
26/10/2004 Ken Davis finishes !18 to 180000
04/10/2004 Mark Rodenkirch proves 58298!3-1 (digits:84173) prime
25/09/2004 Mark Rodenkirch proves 57675!3-1 (digits:83184) prime
02/09/2004 Ken Davis proves 175500!18-1 (digits:46900) prime
25/08/2004 Ian Brown finishes !5 to 100000
17/08/2004 Ken Davis proves 173648!18+1 (digits:46361) prime
19/07/2004 David Kokales and Ian Brown combine to prove 73908!6+1 (digits:54626) prime
17/06/2004 David Kokales joins the search
19/05/2004 Multisieve verification finished. No problems found
06/05/2004 Jason Fraser finishes !3-1 to 57500
04/05/2004 Ken Davis finishes !13 to 130000
28/04/2004 Steven Harvey finishes !16 to 160000
18/04/2004 Ken Davis finishes !20 to 200000
07/04/2004 Ken Davis proves 197930!20-1 (digits:48122) and 198448!20-1 (digits:48259) prime
30/03/2004 Ian Brown proves 86328!5-1 (digits:77730) prime
26/03/2004 Kimmo Herranen proves 96252!8-1 (digits:54736) prime
25/03/2004 Jason Fraser proves 56282!3-1 (digits:80976) prime
24/03/2004 Kimmo Herranen proves 94566!8-1 (digits:53686) prime
17/03/2004 Ken Davis proves 242893!11-1 (digits:109330) prime
29/02/2004 Kimmo Herranen proves 107116!8+1 (digits:61535) prime
25/02/2004 Ian Brown proves 63783!5+1 (digits:55755) prime
23/02/2004 Ian Brown proves 77535!5+1 (digits:69090) prime
23/02/2004 Kimmo Herranen proves 94530!8+1 (digits:53664) prime
21/02/2004 Kimmo Herranen proves 93820!8+1 (digits:53223) prime
16/02/2004 Ken Davis proves 3597!2+2 (digits:5617) prime
more information including certificate (2.8M zipped)
08/02/2004 Kimmo Herranen proves 82730!8+1 (digits:46367) prime
01/02/2004 Kimmo Herranen proves 76986!8+1 (digits:42847) prime
31/01/2004 Kimmo Herranen proves 71256!8+1 (digits:39359) prime
30/01/2004 Andrea Pacini proves 168231!21-1 (digits:38388) prime
22/01/2004 Steven Harvey proves 152818!16-1 (digits:45370) prime
06/01/2004 Ian Brown Proves 69508!5-1 (digits:61278) prime
29/12/2003 Michael Lau's finding of 54890!23+1 means that
Gigantic primes are now known for all types
24/12/2003 Ken Davis proves 129197!11+1 (digits:54935) prime
22/12/2003 Andrea Pacini proves 161571!21-1 (digits:36734) prime
22/12/2003 Michael Lau provides complete list of !23+1 primes to 50000
20/12/2003 Ian Brown proves 67943!5-1 (digits:59764) prime
19/12/2003 Our search MultiF
now has 41 numbers on The
Prime Pages
10/12/2003 Andrea Pacini finds his first large prime 158826!21-1 (digits:36054)
08/12/2003 Steven Harvey proves 106498!12+1 (digits:40766) prime
01/12/2003 Ian Brown proves 50555!5-1 (digits:43172) prime
27/11/2003 Steven Harvey proves 111852!12+1 (digits:43013) prime
29/11/2003 Ian Brown finishes his search for !10+/-1 primes at 100000
28/11/2003 Ken Davis proves 179570!20+1 (digits:43279) prime
27/11/2003 Steven Harvey proves 108572!12+1 (digits:41635) prime
27/11/2003 Steven Harvey proves 108096!12-1 (digits:41435) prime
26/11/2003 Andrea Pacini completes !21-1 to 155000
26/11/2003 Ian Brown proves 154226!14-1 (digits:52372) prime
25/11/2003 Mark Rodenkirch proves 97424!9-1 (digits:49304) prime
25/11/2003 Mark Rodenkirch proves 92390!9+1 (digits:46520) prime
25/11/2003 Ken Davis proves 175516!20+1 (digits:42215) prime
25/11/2003 Ken Davis proves 174168!20+1 (digits:41862) prime
25/11/2003 Steven Harvey proves 107830!12+1 (digits:41324) prime
18/11/2003 Steven Harvey finishes his search for !7+1 primes at 70000
16/11/2003 Andrea Pacini completes !21-1 to 150000
15/11/2003 Steven Harvey proves 67281!7+1 (digits:42232) prime
15/11/2003 Ian Brown proves 95916!10+1 (digits:43622) prime
10/11/2003 Ian Brown proves 93612!10-1 (digits:42475) prime
05/11/2003 Ian Brown proves 182640!14-1 (digits:62979) prime
04/11/2003 Ken Davis proves 52608!2+1 (digits:112762) prime (new record multifactorial)
03/11/2003 Ken Davis proves 126335!11+1 (digits:53606) prime
28/10/2003 Ian Brown proves 198474!14-1 (digits:68950) prime
23/10/2003 Ian Brown proves 157764!14-1 (digits:53685) prime
22/10/2003 Ian Brown proves 175678!14-1 (digits:60367) prime
22/10/2003 Ian Brown proves 175678!14-1 (digits:60367) prime
13/10/2003 Mark Rodenkirch provides fixed version of multisieve
11/10/2003 Mark Rodenkirch announces bug in multisieve
30/09/2003 Steven Harvey proves 55458!6+1 (digits:39837) prime
27/09/2003 Steven Harvey Completes !5+1 to 50000
24/09/2003 Andrea Pacini joins the search
17/09/2003 Mark Rodenkirch starts searching !9+/-1
17/09/2003 Ken Davis proves 105576!13-1 (digits:37274) prime
16/09/2003 Kimmo Herranen joins the search and finds three !8-1 primes on the same day
15/09/2003 Matt Mills proves 31690!4+1 (digits:32221) prime
14/09/2003 Matt Mills proves 30972!4+1 (digits:31414) prime
13/09/2003 Steven Harvey proves 46576!6+1 (digits:32869) prime
06/09/2003 !11-1 completed to 200000 (88489 digits). Largest prime found 166524!11-1 (digits:72474)
05/09/2003 Ronny Edler completes !25+/-1 to 120000
04/09/2003 Steven Harvey proves 39743!5+1 (digits:33109) prime
04/09/2003 48244!4-1 (digits:51252) is prime
02/09/2003 103148!13+1 (digits:36336) is prime
29/08/2003 102813!13-1 (digits:36207) is prime
23/08/2003 Steven Harvey starts searching !5+1 and !6+1
22/08/2003 Steven Harvey finishes his search for !3+/-1 primes at 55500
18/08/2003 Michael Lau completes !23+1 to 48110
13/08/2003 Steven Harvey starts searching !5-1
08/08/2003 Ian Brown completes !15 to 100000
25/07/2003 98433!13+1 (digits: 34522) is prime
17/07/2003 Ian Brown submits over 150 primes with >
5000 digits including 168864!24+1 (digits:33728); 169028!24-1 (digits:33764)
153397!23-1 (digits:31693); 162222!22+1 (digits:35219); 151896!22-1 (digits:32780);
135523!21+1 (digits:30320); 134145!21-1 (digits:29983); 131624!20+1 (digits:30836)
and 154822!20-1 (digits:36816)
13/07/2003 39746!4-1 (digits: 41388) is prime
12/07/2003 Steven Harvey proves 50649!3+1 (digits:72098) prime
25/06/2003 Steven Harvey proves 51393!3+1 (digits:73266) prime
23/06/2003 Matt Mills joins the search
22/06/2003 36072!4-1 (digits: 37183) is prime
07/06/2003 Jiong Sun finishes !18 to 150000
02/06/2003 Ronny Edler completes !25 to 100000
27/05/2003 Ian Brown extends his search to !17 and !19
22/05/2003 Michael Lau extends !23+1 to 39730
21/05/2003 Ian Brown provides more primes of the form !20-1,!21-1 and !22-1
20/05/2003 Didier BOIVIN finishes !24+1 to 80000
15/05/2003 Jiong Sun finishes !18 to 120000
14/05/2003 Ian Brown finishes !20-1,!21-1,!22,!24-1 to 100000
29/04/2003 Steven Harvey proves 46487!3+1 (digits:65597) prime
29/04/2003 Ian Brown expands his search to include !20,!21,!22 and !23-1
29/04/2003 Thomas Wolter proves 141218!14+1 (digits:47569) prime
27/04/2003 Ian Brown joins the search (!24-1)
26/04/2003 Primes > 10000 digits found for 24 out of 48 types
19/04/2003 Thomas Wolter proves 140032!14+1 (digits:47133) prime
11/04/2003 Thomas Wolter proves 136174!14+1 (digits:45717) prime
31/03/2003 Primes of > 5000 digits known for all types
29/03/2003 Ronny Edler completes n!25 to 70000
26/03/2003 Discover's name (and prime pages prover code) added to all primes > 30000
26/03/2003 Didier BOIVIN completes n!24+1 to 65000
25/03/2003 Ian Brown's data for n!14 to 130000 included
21/03/2003 Michael Lau completes n!23+1 to 36500
14/03/2003 Jiong Sun starts searching n!2+1
11/03/2003 Steven Harvey finishes his search of n!2+1 (to 40000)
11/03/2003 Ronny Edler completes n!25 to 50000
10/03/2003 Primes of > 3000 digits known for all types
08/03/2003 Ken Davis proves 166524!11-1 (digits:72474) prime
03/03/2003 Jiong Sun completes n!18-1 to 70000
01/03/2003 Didier BOIVIN completes n!24+1 to 20000
28/02/2003 Mark Rodenkirch completes n!8 to 20700
09/02/2003 Ken Davis proves 44318!2-1 (digits:93343) prime