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

Terms

a(0) =7a(1) =17a(2) =23a(3) =41a(4) =167a(5) =211a(6) =431a(7) =563a(8) =569a(9) =619a(10) =1109a(11) =5413a(12) =10427a(13) =16063a(14) =20323a(15) =28843a(16) =47969a(17) =56489a(18) =71399a(19) =75659a(20) =99089a(21) =107609a(22) =118259a(23) =145949a(24) =203459a(25) =211891a(26) =626443a(27) =1668503a(28) =5628757a(29) =16259473