Numbers k such that 5*10^k + 81 is prime.

Terms

a(0) =1a(1) =3a(2) =6a(3) =16a(4) =30a(5) =33a(6) =36a(7) =37a(8) =85a(9) =288a(10) =561a(11) =805a(12) =850a(13) =1057a(14) =1192a(15) =1312a(16) =2571a(17) =4579a(18) =5223a(19) =5940a(20) =10191a(21) =18756a(22) =24564a(23) =29595a(24) =43891a(25) =65905a(26) =89118a(27) =97963a(28) =112003a(29) =139945