Integers k such that 19*(10^k) + 1 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =11a(4) =18a(5) =25a(6) =60a(7) =71a(8) =85a(9) =168a(10) =285a(11) =627a(12) =872a(13) =1092a(14) =1101a(15) =1169a(16) =1974a(17) =2011a(18) =2135a(19) =2405a(20) =10147a(21) =14029a(22) =16121a(23) =17501a(24) =46548