Divisible only by primes congruent to 5 mod 7.

Terms

a(0) =1a(1) =5a(2) =19a(3) =25a(4) =47a(5) =61a(6) =89a(7) =95a(8) =103a(9) =125a(10) =131a(11) =173a(12) =229a(13) =235a(14) =257a(15) =271a(16) =305a(17) =313a(18) =361a(19) =383a(20) =397a(21) =439a(22) =445a(23) =467a(24) =475a(25) =509a(26) =515a(27) =523a(28) =593a(29) =607