Primes of the form 2*n^2 - 1.

Terms

a(0) =7a(1) =17a(2) =31a(3) =71a(4) =97a(5) =127a(6) =199a(7) =241a(8) =337a(9) =449a(10) =577a(11) =647a(12) =881a(13) =967a(14) =1151a(15) =1249a(16) =1567a(17) =2311a(18) =2591a(19) =2887a(20) =3041a(21) =3361a(22) =3527a(23) =3697a(24) =4049a(25) =4231a(26) =4801a(27) =4999a(28) =5407a(29) =6271