Primes with first digit 4.

Terms

a(0) =41a(1) =43a(2) =47a(3) =401a(4) =409a(5) =419a(6) =421a(7) =431a(8) =433a(9) =439a(10) =443a(11) =449a(12) =457a(13) =461a(14) =463a(15) =467a(16) =479a(17) =487a(18) =491a(19) =499a(20) =4001a(21) =4003a(22) =4007a(23) =4013a(24) =4019a(25) =4021a(26) =4027a(27) =4049a(28) =4051a(29) =4057