Numbers k such that (55*10^k + 377)/9 is prime.

Terms

a(0) =1a(1) =2a(2) =4a(3) =20a(4) =40a(5) =61a(6) =62a(7) =82a(8) =169a(9) =172a(10) =214a(11) =874a(12) =1520a(13) =1652a(14) =2185a(15) =3221a(16) =4012a(17) =4669a(18) =13165a(19) =18922a(20) =91142a(21) =106222