Numbers k such that (10^k + 191)/3 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =7a(5) =13a(6) =18a(7) =33a(8) =39a(9) =126a(10) =154a(11) =168a(12) =213a(13) =4150a(14) =4153a(15) =5658a(16) =6394a(17) =21993a(18) =29674a(19) =38936a(20) =47095a(21) =94096a(22) =135174a(23) =139398