Numbers k such that 28*10^k + 1 is prime.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =16a(7) =19a(8) =22a(9) =37a(10) =58a(11) =547a(12) =570a(13) =817a(14) =1068a(15) =1909a(16) =12809a(17) =14470a(18) =18209a(19) =33176a(20) =33412a(21) =42176a(22) =49798a(23) =89401