Numbers k such that (3^k + 4^k)/7 is prime.

Terms

a(0) =3a(1) =5a(2) =19a(3) =37a(4) =173a(5) =211a(6) =227a(7) =619a(8) =977a(9) =1237a(10) =2437a(11) =5741a(12) =13463a(13) =23929a(14) =81223a(15) =121271