Numbers k such that 7*10^k + 87 is prime.

Terms

a(0) =1a(1) =2a(2) =5a(3) =6a(4) =18a(5) =23a(6) =59a(7) =86a(8) =115a(9) =119a(10) =251a(11) =365a(12) =370a(13) =447a(14) =1672a(15) =3076a(16) =3973a(17) =5611a(18) =7687a(19) =8824a(20) =13026a(21) =17141a(22) =17971a(23) =23346a(24) =29138a(25) =94373a(26) =94563a(27) =142189a(28) =156956a(29) =255167