Numbers k such that (151*10^k - 1)/3 is prime.

Terms

a(0) =1a(1) =3a(2) =6a(3) =15a(4) =19a(5) =34a(6) =37a(7) =88a(8) =141a(9) =216a(10) =239a(11) =246a(12) =288a(13) =365a(14) =429a(15) =762a(16) =1879a(17) =2309a(18) =9555a(19) =19843a(20) =28348a(21) =45058a(22) =62879a(23) =86963a(24) =90669a(25) =148020a(26) =148601a(27) =199003a(28) =289877