Divisible only by primes congruent to 5 mod 8.

Terms

a(0) =1a(1) =5a(2) =13a(3) =25a(4) =29a(5) =37a(6) =53a(7) =61a(8) =65a(9) =101a(10) =109a(11) =125a(12) =145a(13) =149a(14) =157a(15) =169a(16) =173a(17) =181a(18) =185a(19) =197a(20) =229a(21) =265a(22) =269a(23) =277a(24) =293a(25) =305a(26) =317a(27) =325a(28) =349a(29) =373