Numbers k such that 2*25^k - 1 is prime.

Terms

a(0) =2a(1) =3a(2) =8a(3) =12a(4) =15a(5) =27a(6) =48a(7) =89a(8) =137a(9) =666a(10) =1383a(11) =1530a(12) =2102a(13) =8868a(14) =95031a(15) =111768a(16) =130200a(17) =341540