Numbers k such that (19*10^k + 191)/3 is prime.

Terms

a(0) =1a(1) =3a(2) =4a(3) =9a(4) =10a(5) =11a(6) =14a(7) =25a(8) =38a(9) =74a(10) =110a(11) =133a(12) =145a(13) =469a(14) =1035a(15) =1808a(16) =3323a(17) =4534a(18) =4875a(19) =5306a(20) =16645a(21) =20591a(22) =25904a(23) =29365a(24) =81488a(25) =108184a(26) =132550