Numbers k such that (37*10^k + 377)/9 is prime.

Terms

a(0) =1a(1) =3a(2) =9a(3) =25a(4) =36a(5) =54a(6) =108a(7) =115a(8) =147a(9) =213a(10) =465a(11) =685a(12) =768a(13) =804a(14) =1951a(15) =3355a(16) =12525a(17) =15097a(18) =15795a(19) =22159a(20) =95895a(21) =185811