Numbers k such that 4^k + 13 is prime.

Terms

a(0) =1a(1) =2a(2) =4a(3) =10a(4) =19a(5) =32a(6) =40a(7) =146a(8) =566a(9) =2054a(10) =9967a(11) =62639a(12) =87814a(13) =141092