Number of primes less than or equal to Pi^n.

Terms

a(0) =0a(1) =2a(2) =4a(3) =11a(4) =25a(5) =62a(6) =162a(7) =433a(8) =1175a(9) =3229a(10) =9042a(11) =25549a(12) =73050a(13) =210356a(14) =610041a(15) =1779830a(16) =5218745a(17) =15372304a(18) =45455747a(19) =134882577a(20) =401480918a(21) =1198344171a(22) =3585783711a(23) =10754085805a(24) =32319203663a(25) =97312548674a(26) =293515297707a(27) =886720888966