go back

Record history for k=12

k Primes Type Digits Year Discoverer
12 906644189971753846618980352 233# 2n + 1, n=0..11 CC, 2nd kind 123 2015 Andrey Balyakin
12 x81d 61# 2n 1, n=45..50 BiTwin 118 2014 Primecoin
12 x83c 71# 2n - 1, n=0..11 CC, 1st kind 112 2014 Primecoin
12 x81c 53# 2n 1, n=0..5 BiTwin 101 2013 Primecoin
12 x81b 43# 2n + 1, n=0..11 CC, 2nd kind 99 2013 Primecoin
12 13931865163581 127# 2n + 1, n=0..11 CC, 2nd kind 64 2008 Dirk Augustin, NewPGen, PrimeForm
12 (8428860 127# + 212148902055090) 2n + 1, n=0..11 CC, 2nd kind 58 2006 Jens K. Andersen
12 (4691553 97# + 704765232261090) 2n 1, n=0..5 BiTwin 44 2004 Jens K. Andersen
12 332352838383 80# + 38458151 + 0,2,6,8,12,18,20,26,30,32,36,42 Tuplet 43 2003 Jens K. Andersen
12 5027317106963 75# + 1418575498567 + 0,6,10,12,16,22,24,30,34,36,40,42 Tuplet 42 2001 Norman Luhn