Numbers k such that k*4^k + 1 is prime.

Terms

a(0) =1a(1) =3a(2) =7a(3) =33a(4) =67a(5) =223a(6) =663a(7) =912a(8) =1383a(9) =3777a(10) =3972a(11) =10669a(12) =48375