Numerators of lower primes-only best approximates (POBAs) to Pi; see Comments.

Terms

a(0) =5a(1) =13a(2) =19a(3) =31a(4) =37a(5) =53a(6) =97a(7) =191a(8) =223a(9) =757a(10) =977a(11) =4483a(12) =5237a(13) =9497a(14) =14423a(15) =18061a(16) =30841a(17) =45751a(18) =47881a(19) =60661a(20) =137341a(21) =162901a(22) =177811a(23) =536273a(24) =557573a(25) =577453a(26) =579583a(27) =609403a(28) =610823a(29) =833719