Number of primes up to 10^(n/4).

Terms

a(0) =0a(1) =0a(2) =2a(3) =3a(4) =4a(5) =7a(6) =11a(7) =16a(8) =25a(9) =40a(10) =65a(11) =102a(12) =168a(13) =275a(14) =446a(15) =739a(16) =1229a(17) =2039a(18) =3401a(19) =5703a(20) =9592a(21) =16144a(22) =27293a(23) =46243a(24) =78498a(25) =133551a(26) =227647a(27) =388683a(28) =664579a(29) =1138288