Numbers k such that (19*10^k - 61)/3 is prime.

Terms

a(0) =1a(1) =2a(2) =4a(3) =10a(4) =17a(5) =33a(6) =51a(7) =63a(8) =92a(9) =441a(10) =517a(11) =578a(12) =1252a(13) =1456a(14) =2261a(15) =4857a(16) =8420a(17) =9872a(18) =13444a(19) =14175a(20) =16316a(21) =28978a(22) =30865a(23) =84409a(24) =145499