Numbers k such that 10*7^k + 1 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =5a(4) =7a(5) =9a(6) =11a(7) =14a(8) =22a(9) =45a(10) =54a(11) =67a(12) =74a(13) =321a(14) =706a(15) =902a(16) =962a(17) =11393a(18) =13605a(19) =17005a(20) =17364a(21) =27129a(22) =27674a(23) =29447