Numbers k such that (7^k - 5^k)/2 is prime.

Terms

a(0) =3a(1) =5a(2) =7a(3) =113a(4) =397a(5) =577a(6) =7573a(7) =14561a(8) =58543a(9) =100019a(10) =123407a(11) =136559a(12) =208283a(13) =210761a(14) =457871a(15) =608347a(16) =636043