Number of primes < n^3.

Terms

a(0) =0a(1) =4a(2) =9a(3) =18a(4) =30a(5) =47a(6) =68a(7) =97a(8) =129a(9) =168a(10) =217a(11) =269a(12) =327a(13) =400a(14) =476a(15) =564a(16) =656a(17) =765a(18) =882a(19) =1007a(20) =1147a(21) =1298a(22) =1457a(23) =1633a(24) =1821a(25) =2020a(26) =2227a(27) =2460a(28) =2707a(29) =2961