k Digits Early discovery with at least 100 digits to given pattern Who When
1 157 2521 − 1 Raphael Mitchel Robinson 30 Jan 1952
2 221 213 • 2726 ± 1 Wilfrid Keller ≤ 1980
3-5 - No reliable information
6 133 2 • 10132 + 75543532187 + d d = 0, 4, 6, 10, 12, 16 Tony Forbes Apr 1994
7 110 45741427235 • 241# + 1042090781 + d d = 0, 2, 6, 8, 12, 18, 20 Norman Luhn 23 Feb 2001
7 104 4293326603 • 233# + 399389 + d d = 0, 2, 8, 12, 14, 18, 20 Radoslaw Naleczynski 31 Dec 1998
8 110 388793398651 • 241# + 1042090781 + d d = 0, 2, 6, 8, 12, 18, 20, 26 Norman Luhn 23 Feb 2001
8 150 106584067562782 • 337# + 88793 + d d = 0, 6, 8, 14, 18, 20, 24, 26 Norman Luhn 13 Jan 2010
8 142 243551752728 • 317# + 1277 + d d = 0, 2, 6, 12, 14, 20, 24, 26 Graeme Leese, Michael Bell, Matt Jack, Michael Davison, Ben Lowing, Tim Nightingale 26 Jun 2001
9 110 388793398651 • 241# + 1042090781 + d d = 0, 2, 6, 8, 12, 18, 20, 26, 30 Norman Luhn 23 Feb 2001
9 135 394833958615791 • 293# + 29247917 + d d = 0, 2, 6, 12, 14, 20, 24, 26, 30 Norman Luhn 9 Feb 2017
9 135 106345403186416 • 293# + 29247913 + d d = 0, 4, 6, 10, 16, 18, 24, 28, 30 Norman Luhn 9 Feb 2017
9 150 68663510211259 • 337# + 88789 + d d = 0, 4, 10, 12, 18, 22, 24, 28, 30 Norman Luhn 13 Jan 2010
10 103 72613488698235 • 227# + 39058751 + d d = 0, 2, 6, 8, 12, 18, 20, 26, 30, 32 Norman Luhn 11 Apr 2004
10 136 772556746441918 • 293# + 29247917 + d d = 0, 2, 6, 12, 14, 20, 24, 26, 30, 32 Norman Luhn 9 Feb 2017
11 104 24698258 • 239# + 28606476153371 + d d = 0, 2, 6, 8, 12, 18, 20, 26, 30, 32, 36 Norman Luhn,
Jens Kruse Andersen		 18 Aug 2004
11 120 930197240142688565 • 257# / 66 − 12 + d d = 0, 4, 6, 10, 16, 18, 24, 28, 30, 34, 36 Ryan Propper; Serge Batalov 15 May 2026
12 108 13243795731372733191902494675154142263612189966992593522251
560981597803197621024152571147501 + 27407861785763183 • 229# + d
d = 0, 2, 6, 8, 12, 18, 20, 26, 30, 32, 36, 42		 Peter Kaiser, David Stevens 23 Sep 2019
12 Not yet found ! d = 0, 6, 10, 12, 16, 22, 24, 30, 34, 36, 40, 42

k Digits Early discovery with at least 200 digits to given pattern Who When
1 386 21279 − 1 Raphael Mitchel Robinson 25 Jun 1952
2 221 213 • 2726 ± 1 Wilfrid Keller ≤ 1980
3 - No reliable information
4 241 2800 + 10169432335 + d d = 0, 2, 6, 8 Tony Forbes 1994
5 232 2768 + 108676793455855 + d d = 0, 2, 6, 8, 12 Tony Forbes 1997
5 229 890803 • 547# + 42642569857 + d d = 0, 4, 6, 10, 12 Norman Luhn 19 Dec 2000
6 213 1189609319 • 503# / 613777 + 446215867 + d d = 0, 4, 6, 10, 12, 16 Michael Bell 12 Sep 2000
7 219 1839198074074 • 499# + 165701 + d d = 0, 2, 6, 8, 12, 18, 20 Norman Luhn 14 Jun 2004
7 282 251733155478 • 647# + 1146779 + d d = 0, 2, 8, 12, 14, 18, 20 Norman Luhn 4 Jan 2006
8 218 330846961 • 503# + 349129635971 + d d = 0, 2, 6, 8, 12, 18, 20, 26 Jens Kruse Andersen 1 Mar 2008
8 206 12874261020824 • 463# + 88793 + d d = 0, 6, 8, 14, 18, 20, 24, 26 Norman Luhn 6 Aug 2005
8 236 29995576270632 • 547# + 1277 + d d = 0, 2, 6, 12, 14, 20, 24, 26 Norman Luhn 24 Jun 2014
9 214 288807316346272652375 • 463# + 8750853101 + d d = 0, 2, 6, 8, 12, 18, 20, 26, 30 Thomas Nguyen 25 Nov 2019
9 203 663579549486449 • 457# + 1277 + d d = 0, 2, 6, 12, 14, 20, 24, 26, 30 Norman Luhn 16 Mar 2017
9 269 29090165633510816986419565613504366261519944637538614399533972240
0236057821426952579658098504166333411889 • 401# + 380284918609483 +d
d = 0, 4, 6, 10, 16, 18, 24, 28, 30		 Riecoin #1551825 27 Jul 2021
9 234 25115804149615210734630778763326825671828439272015179326163578805
3028333576682615819341450443970 • 347# + 855709 +d
d = 0, 4, 10, 12, 18, 22, 24, 28, 30		 Riecoin #1482856 29 Mar 2021
10 269 29090165633510816986419565613504366261519944637538614399533972240
0236057821426952579658098504166333411889 • 401# + 380284918609481 + d
d = 0, 2, 6, 8, 12, 18, 20, 26, 30, 32		 Riecoin #1551825 27 Jul 2021
10 282 1431561495603041874786748889520819956675087352890831697627417420
8238191434937011407287479676495550 • 449# + 226554621544607 + d
d = 0, 2, 6, 12, 14, 20, 24, 26, 30, 32		 Riecoin #1579367 12 Sep 2021

k Digits Early discovery with at least 300 digits to given pattern Who When
1 386 21279 − 1 Raphael Mitchel Robinson 25 Jun 1952
2 313 177 • 21032 ± 1 Wilfrid Keller ≤ 1980
3 318 21056 + 1301655396715 + d d = 0, 2, 6 Tony Forbes 1994
3 305 10304 + 835642263 + d d = 0, 4, 6 Tony Forbes 1994
4 318 21056 + 1301655396715 + d d = 0, 2, 6, 8 Tony Forbes 1994
5 318 3188356293605443904 • (2993 − 2331) − 6 • 2331 − 7 + d d = 0, 2, 6, 8, 12 Tony Forbes 3 Feb 1999
5 384 3242281037 • 887# + 1867 + d d = 0, 4, 6, 10, 12 Michael Bell 26 Dec 2000
6 301 110282080125 • 691# + 6005887 + d d = 0, 4, 6, 10, 12, 16 Norman Luhn 18 Oct 2001
7 301 68841237 • 701# + 2525568581 + d d = 0, 2, 6, 8, 12, 18, 20 Jens Kruse Andersen 24 Jun 2009
7 402 4733578067069 • 937# + 626609 + d d = 0, 2, 8, 12, 14, 18, 20 Norman Luhn 9 May 2016
8 304 359378518392551 • 691# + 23983691 + d d = 0, 2, 6, 8, 12, 18, 20, 26 Norman Luhn 4 Jul 2017
8 300 1212340784099271490340192069587905739740195437607921019284691165230
98424880257116547389250193358233179853793 • 463# + 27899359258013 + d
d = 0, 6, 8, 14, 18, 20, 24, 26		 Riecoin #1566147 20 Aug 2021
8 Not yet found ! d = 0, 2, 6, 12, 14, 20, 24, 26
9 302 3662943827507055653453285926700023101620402654194921037456914703634
367453333223968004841750810165461896894501 • 463# + 2325810733931801 + d
d = 0, 2, 6, 8, 12, 18, 20, 26, 30		 Riecoin #1567399 22 Aug 2021
9 Not yet found ! d = 0, 2, 6, 12, 14, 20, 24, 26, 30
9 Not yet found ! d = 0, 4, 6, 10, 16, 18, 24, 28, 30
9 307 154140554027854736762047378850909920571712371864836723122728277535
436255651743244125969075784222257 • 503# + 226193845148629 + d
d = 0, 4, 10, 12, 18, 22, 24, 28, 30		 Riecoin #1921294 27 Apr 2023

k Digits Early discovery with at least 400 digits to given pattern Who When
1 664 22203 − 1 Raphael Mitchel Robinson 7 Oct 1952
2 401 1065 • 21321 ± 1 Wilfrid Keller ≤ 1980
3 1041 23456 + 5661177712051 + d d = 0, 2, 6 Tony Forbes (PRP)
François Morain (proven primes)		 1995
1998
3 401 4 • 10400 + 6368335473 + d d = 0, 4, 6 Tony Forbes 1994
4 400 10399 + 34993836001 + d d = 0, 2, 6, 8 Warut Roonguthai 1995
5 427 63687452535 • 997# + 1002054791 + d d = 0, 2, 6, 8, 12 Norman Luhn 7 May 2001
5 427 282316412894 • 997# + 16057 + d d = 0, 4, 6, 10, 12 Norman Luhn 17 Jan 2006
6 427 328481121285 • 997# + 16057 + d d = 0, 4, 6, 10, 12, 16 Norman Luhn 17 Jan 2006
7 515 115828580393941 • 1193# + 5132201 + d d = 0, 2, 6, 8, 12, 18, 20 Norman Luhn 18 Jan 2018
7 402 4733578067069 • 937# + 626609 + d d = 0, 2, 8, 12, 14, 18, 20 Norman Luhn 9 May 2016
8 401 362079385668757696008683096558661746463 • 863# + 114023297140211 + d d = 0, 2, 6, 8, 12, 18, 20, 26 Michalis Christou, rieMiner 0.93 10 Sep 2023
8 Not yet found ! d = 0, 2, 6, 12, 14, 20, 24, 26
8 Not yet found ! d = 0, 6, 8, 14, 18, 20, 24, 26

k Digits Early discovery with at least 500 digits to given pattern Who When
1 664 22203 − 1 Raphael Mitchel Robinson 7 Oct 1952
2 703 1159142985 • 22304 ± 1 Arthur Oliver Lonsdale Atkin, Neil W. Rickert ≤ 1980
3 1041 23456 + 5661177712051 + d d = 0, 2, 6 Tony Forbes (PRP); François Morain (proven primes) 1995 - 1998
3 501 21664 + 3405302217 + d d = 0, 4, 6 Tony Forbes 1994
4 500 10499 + 883750143961 + d d = 0, 2, 6, 8 Warut Roonguthai 1996
5 511 19685846183 • 1193# + 6005891 + d d = 0, 2, 6, 8, 12 Norman Luhn 12 May 2002
5 1107 424232794973 • 2593# + 43777 + d d = 0, 4, 6, 10, 12 Norman Luhn 24 Mar 2009
6 559 601545895935 • 1297# + 43777 + d d = 0, 4, 6, 10, 12, 16 Norman Luhn 1 May 2009
7 515 115828580393941 • 1193# + 5132201 + d d = 0, 2, 6, 8, 12, 18, 20 Norman Luhn 18 Jan 2018
7 Not yet found ! d = 0, 2, 8, 12, 14, 18, 20

k Digits Early discovery with at least 600 digits to given pattern Who When
1 664 22203 − 1 Raphael Mitchel Robinson 7 Oct 1952
2 703 1159142985 • 22304 ± 1 Arthur Oliver Lonsdale Atkin; Neil W. Rickert ≤ 1980
3 1041 23456 + 5661177712051 + d d = 0, 2, 6 Tony Forbes (PRP)
François Morain (proven primes)		 1995
1998
3 607 22016 + 2294808807 + d d = 0, 4, 6 Tony Forbes 1994
4 600 10599 + 1394283756151 + d d = 0, 2, 6, 8 Warut Roonguthai 1997
5 1034 31969211688 • 2399# + 16061 + d d = 0, 2, 6, 8, 12 Norman Luhn 30 Jul 2002
5 1107 424232794973 • 2593# + 43777 + d d = 0, 4, 6, 10, 12 Norman Luhn 24 Mar 2009
6 600 8700325136612927132017229726082016541451211848876030155639862649818849145646358
2776862739687819998728687224597771118574844697175398328070762971115423157263105
3566230084276478860232272076445472609936600314711359991274351974702131352485721
3838992173535645487774803822922600418333620397100764757090984242354994918618538
2797676282255224158287242481391522282240117490588685419026728 • 547# + 7187767 + d



d = 0, 4, 6, 10, 12, 16		 Vidar Nakling 6 Oct 2014
7 1002 113225039190926127209 • 2339# / 57057 + 1 + d d = 0, 2, 6, 8, 12, 18, 20 Peter Kaiser 27 Jan 2021
7 Not yet found ! d = 0, 2, 8, 12, 14, 18, 20

k Digits Early discovery with at least 700 digits to given pattern Who When
1 969 23217 − 1 Hans Riesel 8 Sep 1957
2 703 1159142985 • 22304 ± 1 Arthur Oliver Lonsdale Atkin; Neil W. Rickert ≤ 1980
3 1041 23456 + 5661177712051 + d d = 0, 2, 6 Tony Forbes (PRP)
François Morain (proven primes)		 1995 - 1998
3 723 22400 + 14906370057 + d d = 0, 4, 6 Tony Forbes 1994
4 700 10699 + 547634621251 + d d = 0, 2, 6, 8 Warut Roonguthai 1998
5 1034 31969211688 • 2399# + 16061 + d d = 0, 2, 6, 8, 12 Norman Luhn 30 Jul 2002
5 1107 424232794973 • 2593# + 43777 + d d = 0, 4, 6, 10, 12 Norman Luhn 24 Mar 2009
6 700 39192012090354765012032937869636204461831938640723950845316702443917898504549
87906003102989312450780116651414887182211444027280088419855460746204272350986
69951080416452987007849969199215172254155195529863097969853084190453728650037
452220380184681391570092753684727879715473377537 • 1013# + 6503587 + d


d = 0, 4, 6, 10, 12, 16		 Vidar Nakling 23 Jan 2015
7 1002 113225039190926127209 • 2339# / 57057 + 1 + d d = 0, 2, 6, 8, 12, 18, 20 Peter Kaiser 27 Jan 2021
7 Not yet found ! d = 0, 2, 8, 12, 14, 18, 20

k Digits Early discovery with at least 800 / 900 digits to given pattern Who When
1 969 23217 − 1 Hans Riesel 8 Sep 1957
2 1040 256200945 • 23426 ± 1 Arthur Oliver Lonsdale Atkin & Neil W. Rickert Dec 1980
3 1041 23456 + 5661177712051 + d d = 0, 2, 6 Tony Forbes (PRP); François Morain (proven primes) 1995 - 1998
3 1083 437850590 • (23567 − 21189) − 6 • 21189 − 5 + d d = 0, 4, 6 Tony Forbes 04 Dec 1996
4 1004 76912895956636885 • (23279 − 21093) − 6 • 21093 − 7 + d d = 0, 2, 6, 8 Tony Forbes 16 Sep 1998
5 1034 31969211688 • 2399# + 16061 + d d = 0, 2, 6, 8, 12 Norman Luhn 30 Jul 2002
5 1107 424232794973 • 2593# + 43777 + d d = 0, 4, 6, 10, 12 Norman Luhn 24 Mar 2009
6 1037 28993093368077 • 2399# + 19417 + d d = 0, 4, 6, 10, 12, 16 Norman Luhn 14 Mar 2016
7 1002 113225039190926127209 • 2339# / 57057 + 1 + d d = 0, 2, 6, 8, 12, 18, 20 Peter Kaiser 27 Jan 2021
7 Not yet found ! d = 0, 2, 8, 12, 14, 18, 20