Smallest nonempty set S containing prime divisors of 10k+4 for each k in S.

Terms

a(0) =2a(1) =3a(2) =7a(3) =11a(4) =13a(5) =17a(6) =19a(7) =23a(8) =29a(9) =31a(10) =37a(11) =47a(12) =67a(13) =71a(14) =73a(15) =79a(16) =97a(17) =127a(18) =157a(19) =167a(20) =197a(21) =241a(22) =337a(23) =367a(24) =397a(25) =487a(26) =523a(27) =569a(28) =787a(29) =1741