Numbers k such that 7*10^k + 61 is prime.

Terms

a(0) =1a(1) =2a(2) =4a(3) =6a(4) =9a(5) =14a(6) =18a(7) =20a(8) =23a(9) =24a(10) =30a(11) =61a(12) =150a(13) =209a(14) =213a(15) =226a(16) =231a(17) =364a(18) =455a(19) =3990a(20) =15267a(21) =24289a(22) =28270a(23) =94938a(24) =155496