Numbers k such that (10^k + 2)/6 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =4a(4) =6a(5) =10a(6) =12a(7) =15a(8) =33a(9) =55a(10) =56a(11) =61a(12) =154a(13) =201a(14) =462a(15) =570a(16) =841a(17) =848a(18) =1297a(19) =1357a(20) =2008a(21) =2628a(22) =2848a(23) =3111a(24) =6877a(25) =9162a(26) =17766a(27) =33556