Primes having only {0, 2, 7, 9} as digits.

Terms

a(0) =2a(1) =7a(2) =29a(3) =79a(4) =97a(5) =227a(6) =229a(7) =277a(8) =709a(9) =727a(10) =797a(11) =907a(12) =929a(13) =977a(14) =997a(15) =2027a(16) =2029a(17) =2099a(18) =2207a(19) =2297a(20) =2707a(21) =2729a(22) =2777a(23) =2797a(24) =2909a(25) =2927a(26) =2999a(27) =7027a(28) =7079a(29) =7207