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Record history for k=21

k Primes n's Digits Year Discoverer
21 5547796991585989797641 + 29#n 0..20 22 2014 Jaroslaw Wroblewski
21 24657656407921828441 + 47#n 0..20 20 2014 Jaroslaw Wroblewski
21 23260414913723182141 + 47#n 0..20 20 2014 Jaroslaw Wroblewski
21 28112131522731197609 + 19#n 0..20 20 2008 Jaroslaw Wroblewski
21 1925228725347080393 + 47#n 0..20 20 2007 Jaroslaw Wroblewski
21 25521343898340097 + 3741#n 0..20 18 2007 Jaroslaw Wroblewski
21 1245653020090313 + 38437#n 0..20 17 2007 Jaroslaw Wroblewski
21 3135462279378283 + 31637#n 1..21 17 2007 Jaroslaw Wroblewski
21 789337428437009 + 32037#n 1..21 17 2007 Jaroslaw Wroblewski
21 620353098196661 + 8437#n 0..20 17 2007 Jaroslaw Wroblewski
21 9358091177025961 + 1137#n 0..20 17 2007 Jaroslaw Wroblewski
21 556904117141899 + 110511123#n 1..21 16 2006 Markus Frind
21 1291515762123569 + 94767423#n 0..20 16 2006 Markus Frind
21 56211383760397 + 19967823#n 2..22 16 2004 Markus Frind, Paul Jobling, Paul Underwood
21 142072321123 + 636423#n 0..20 14 1990 Paul Pritchard, Andrew Moran, Anthony Thyssen
21 5749146449311 + 268119#n 0..20 13 1990 Paul Pritchard, Andrew Moran, Anthony Thyssen