Record history for smallest AP-k with minimal start
k Primes n's Digits When Discoverer
16 17 + 378230305161714 • 13# • n 0..15 21 3 Feb 2005 Phil Carmody
16 17 + 11387819007325752 • 13# • n 0..15 22 2001 Phil Carmody
 
17 17 + 11387819007325752 • 13# • n 0..16 22 2001 Phil Carmody
 
18 19 + 251988718036418903 • 17# • n 0..17 25 31 Oct 2012 Gennady Gusev
18 47 + 19622534420177523 • 17# • n 0..17 24 9 Jan 2007 Gennady Gusev
18 602521111 + 96575729250 • n 0..17 13 8 Dec 2005 Gennady Gusev
18 1052724247 + 6549 • 17# • n 0..17 11 2002 Gennady Gusev
 
19 19 + 4244193265542951705 • 17# • n 0..18 26 4 Apr 2013 Wojciech Izykowski
19 19 + 13234551541698967679 • 17# • n 0..18 27 26 Feb 2013 Wojciech Izykowski
19 275525353 + 407133393 • 19# • n 0..18 17 26 Jan 2009 Mariusz Szafranski from BOINC@Poland, Jaroslaw Wroblewski
19 275955343 + 368042893 • 19# • n 0..18 17 21 Jan 2009 Mariusz Szafranski from BOINC@Poland, Jaroslaw Wroblewski
19 1358498353 + 16584560 • 19# • n 0..18 16 8 Jan 2009 Machloj from BOINC@Poland, Jaroslaw Wroblewski
19 2027663243 + 1002606 • 19# • n 0..18 15 23 May 2008 Jaroslaw Wroblewski
19 8297644387 + 431 • 19# • n 0..18 11 1984 Paul Pritchard
 
20 23 + 134181089232118748020 • 19# • n 0..19 29 1 Dec 2017 Wojciech Izykowski
20 566547019 + 846627559 • 19# • n 0..19 18 19 Feb 2009 Aleksander Parkitny from BOINC@Poland, Jaroslaw Wroblewski
20 24670154221 + 370766 • 19# • n 0..19 14 1 Feb 2009 Sebastian Jaworowicz from BOINC@Poland, Jaroslaw Wroblewski
20 68469367129 + 4926 • 19# • n 0..19 12 1992 Paul Pritchard
 
21 124701216737 + 9986827 • 19# • n 0..20 16 22 Feb 2009 Ryszard Walczak from BOINC@Poland, Jaroslaw Wroblewski
21 142072321123 + 146372 • 19# • n 0..20 14 1990 Paul Pritchard
 
22 1322554958713 + 2861998 • 23# • n 0..21 17 29 May 2009 Jacek Kotnowski, PrimeGrid, AP26
22 1365385579783 + 405927 • 23# • n 0..21 16 11 Jan 2007 Jaroslaw Wroblewski
22 11410337850553 + 475180 • 19# • n 0..21 15 17 Mar 1993 Paul Pritchard et al.
 
23 18381846925451 + 202602444 • 23# • n 0..22 19 14 Nov 2020 Grebuloner, PrimeGrid AP26
23 20389023122473 + 5785546 • 23# • n 0..22 17 29 May 2009 Eric Markle, PrimeGrid, AP26
23 43760869165417 + 2339805 • 23# • n 0..22 17 25 Feb 2008 Raanan Chermoni & Jaroslaw Wroblewski
23 56211383760397 + 199678 • 23# • n 0..22 16 24 Jul 2004 Markus Frind, Paul Jobling, Paul Underwood
 
24 18381846925451 + 202602444 • 23# • n 0..23 19 14 Nov 2020 Grebuloner, PrimeGrid AP26
24 39421708111691 + 9740894 • 23# • n 0..23 17 9 Jul 2009 Mark Codding, PrimeGrid, AP26
24 167806194923077 + 4935146 • 23# • n 0..23 17 5 May 2009 Andreas Kobara, PrimeGrid, AP26
24 401516288036293 + 608239 • 23# • n 0..23 16 21 Apr 2008 Raanan Chermoni & Jaroslaw Wroblewski
24 468395662504823 + 205619 • 23# • n 0..23 16 18 Jan 2007 Jaroslaw Wroblewski
 
25 2648861307187097 + 94293751 • 23# • n 0..24 18 29 Dec 2018 Tom Greer, PrimeGrid, AP26
25 2960886048458003 + 2346233 • 23# • n 0..24 17 8 Apr 2009 BOINC@Poland , PrimeGrid, AP26
25 6171054912832631 + 366384 • 23# • n 0..24 16 17 May 2008 Raanan Chermoni & Jaroslaw Wroblewski
 
26 3486107472997423 + 1666981 • 23# • n 0..25 17 26 Mar 2012 James Fry
26 43142746595714191 + 23681770 • 23# • n 0..25 18 12 Apr 2010 Benoãt Perichon, PrimeGrid, AP26
 
27 224584605939537911 + 81292139 • 23# • n 0..26 18 19 Sep 2019 Rob Gahan, PrimeGrid, AP26