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

Terms

a(0) =0a(1) =2a(2) =6a(3) =10a(4) =102a(5) =494a(6) =794a(7) =1326a(8) =5242a(9) =5446a(10) =24602a(11) =87606a(12) =188558