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Record history for smallest AP-k with minimal difference
k	Primes	n's	Digits	Year	Discoverer
18	1027994118833642281 + 17# • n	0..17	19	2005	Gennady Gusev & Jens Kruse Andersen
18	24604783199 + 581 • 17# • n	0..17	11	2002	Gennady Gusev
19	1424014323012131633 + 19# • n	0..18	19	2008	Jaroslaw Wroblewski
19	20736372344841161 + 5 • 19# • n	0..18	17	2007	Jaroslaw Wroblewski
19	63734273908111 + 11 • 19# • n	0..18	14	2007	Jaroslaw Wroblewski
19	2773814832407 + 155 • 19# • n	0..18	13	1992	Paul Pritchard
20	1424014323012131633 + 19# • n	0..19	19	2008	Jaroslaw Wroblewski
20	20736372344841161 + 5 • 19# • n	0..19	17	2007	Jaroslaw Wroblewski
20	2773814832407 + 155 • 19# • n	0..19	13	1992	Paul Pritchard
21	28112131522731197609 + 19# • n	0..20	20	2008	Jaroslaw Wroblewski
21	809504830479349 + 208 • 19# • n	0..20	15	2007	Pawel Nowak & Jaroslaw Wroblewski
21	5749146449311 + 2681 • 19# • n	0..20	13	1992	Paul Pritchard
22	166537312120867 + 9959 • 19# • n	0..21	15	2006	Markus Frind
22	497003857949969 + 179998 • 19# • n	0..21	15	2004	Markus Frind
23	403185216600637 + 9523 • 23# • n	0..22	15	2006	Markus Frind
23	100308707032367 + 156722 • 23# • n	0..22	15	2006	Markus Frind
23	56211383760397 + 199678 • 23# • n	0..22	16	2004	Markus Frind, Paul Jobling, Paul Underwood
24	158209144596158501 + 65073 • 23# • n	0..23	18	2014	Bryan Little, AP26
24	515486946529943 + 136831 • 23# • n	0..23	16	2008	Raanan Chermoni & Jaroslaw Wroblewski
24	468395662504823 + 205619 • 23# • n	0..23	16	2007	Jaroslaw Wroblewski
25	6171054912832631 + 366384 • 23# • n	0..24	16	2008	Raanan Chermoni & Jaroslaw Wroblewski
26	3486107472997423 + 1666981 • 23# • n	0..25	17	2012	James Fry
26	43142746595714191 + 23681770 • 23# • n	0..25	18	2010	Benoãt Perichon, PrimeGrid, AP26
27	224584605939537911 + 81292139 • 23# • n	0..26	18	2019	Rob Gahan, PrimeGrid, AP26