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Record history for k=13

k Primes Type Digits Year Discoverer
13 x84 · 61# · 2n - 1, n=0..12 CC, 1st kind 108 2014 Primecoin
13 x83b · 31# · 2n + 1, n=0..12 CC, 2nd kind 96 2013 Primecoin
13 14815550 · 107# + 4385574275277311 + 2,6,8,12,18,20,26,30,32,36,42,48,50 Tuplet 50 2013 Roger Thompson
13 61571 · 107# + 4803194122972361 + 0,2,6,8,12,18,20,26,30,32,36,42,48 Tuplet 48 2009 Jens K. Andersen
13 381955327397348 · 79# + 18393209 + 2,8,14,18,20,24,30,32,38,42,44,48,50 Tuplet 46 2007 Norman Luhn
13 1753286498051 · 71# · 2n - 1, n=0..12 CC, 1st kind 41 2005 Dirk Augustin, NewPGen, PrimeForm
13 (938719 · 67# + 56461354019070) · 2n+1, n=0..12 CC, 2nd kind 33 2004 Jens K. Andersen
13 129017282 · 65# + 3001560376931 + 0,2,6,8,12,18,20,26,30,32,36,42,48 Tuplet 32 2003 Torbjörn Alm & Jens K. Andersen
13 5953176232124 · 50# + 9564671 + 0,2,6,8,12,18,20,26,30,32,36,42,48 Tuplet 31 2003 Jens K. Andersen
13 1000000008282508019026959814211 + 2,6,8,12,18,20,26,30,32,36,42,48,50 Tuplet 31 2000 Joerg Waldvogel & Peter Leikauf