Number of primes < prime(n)^3.

Terms

a(0) =4a(1) =9a(2) =30a(3) =68a(4) =217a(5) =327a(6) =656a(7) =882a(8) =1457a(9) =2707a(10) =3228a(11) =5194a(12) =6850a(13) =7789a(14) =9916a(15) =13746a(16) =18411a(17) =20179a(18) =26062a(19) =30597a(20) =32984a(21) =40991a(22) =46959a(23) =56924a(24) =72217a(25) =80725a(26) =85182a(27) =94695a(28) =99669a(29) =110127