Numbers k such that 5^k - 4^k is prime.

Terms

a(0) =3a(1) =43a(2) =59a(3) =191a(4) =223a(5) =349a(6) =563a(7) =709a(8) =743a(9) =1663a(10) =5471a(11) =17707a(12) =19609a(13) =35449a(14) =36697a(15) =45259a(16) =91493a(17) =246497a(18) =265007a(19) =289937