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Record history for k=21

k Primes Type Digits Year Discoverer
21 622803914376064301858782434517 + 0,4,6,10,12, 16,24,30,34,40,42,46,52,54,60,66,70,72,76,82,84 Tuplet 30 2018 Raanan Chermoni & Jaroslaw Wroblewski
21 248283957683772055928836513589 + 0,2,8,12,14, 18,24,30,32,38,42,44,50,54,60,68,72,74,78,80,84 Tuplet 30 2016 Raanan Chermoni & Jaroslaw Wroblewski
21 138433730977092118055599751669 + 0,2,8,12,14, 18,24,30,32,38,42,44,50,54,60,68,72,74,78,80,84 Tuplet 30 2015 Raanan Chermoni & Jaroslaw Wroblewski
21 39433867730216371575457664399 + 0,2,8,12,14,
18,24,30,32,38,42,44,50,54,60,68,72,74,78,80,84
Tuplet 29 2015 Raanan Chermoni & Jaroslaw Wroblewski
21 5547796991585989797641 + 29# n, n=0..20 AP 22 2014 Jaroslaw Wroblewski
21 28112131522731197609 + 19# n, n=0..20 AP 20 2008 Jaroslaw Wroblewski