Numbers k such that (17*10^k - 131)/3 is prime.

Terms

a(0) =1a(1) =2a(2) =3a(3) =6a(4) =8a(5) =14a(6) =33a(7) =56a(8) =266a(9) =305a(10) =332a(11) =435a(12) =548a(13) =585a(14) =591a(15) =890a(16) =996a(17) =4131a(18) =23937a(19) =32016a(20) =81300