Smallest prime of the form: one or more 4's followed by prime(n) (or 0 if no such prime exists).

Terms

a(0) =0a(1) =43a(2) =0a(3) =47a(5) =44444444413a(6) =44417a(7) =419a(8) =4423a(9) =4444444429a(10) =431a(11) =444444437a(12) =4441a(13) =443a(14) =4447a(15) =44453a(16) =44444459a(17) =461a(18) =467a(19) =4444471a(20) =444473a(21) =479a(22) =4483a(23) =44444489a(24) =44497a(25) =44101a(26) =444444103a(28) =444109a(29) =444113a(30) =4127