Numbers k such that 7*10^k + 19 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =27a(5) =32a(6) =63a(7) =69a(8) =107a(9) =145a(10) =154a(11) =173a(12) =190a(13) =271a(14) =412a(15) =1219a(16) =1509a(17) =2392a(18) =4444a(19) =5567a(20) =7424a(21) =32174a(22) =51573