Numbers k such that (101*10^k + 1)/3 is prime.

Terms

a(0) =1a(1) =4a(2) =6a(3) =12a(4) =34a(5) =54a(6) =60a(7) =61a(8) =73a(9) =148a(10) =349a(11) =552a(12) =649a(13) =967a(14) =1044a(15) =2521a(16) =4501a(17) =5721a(18) =6133a(19) =9052a(20) =9880a(21) =16126a(22) =16215a(23) =19146a(24) =61770