Number of primes below n^3 does not exceed n times the number of primes below n^2.

Terms

a(0) =0a(1) =0a(2) =3a(3) =6a(4) =15a(5) =19a(6) =37a(7) =47a(8) =69a(9) =82a(10) =113a(11) =139a(12) =180a(13) =216a(14) =244a(15) =300a(16) =381a(17) =423a(18) =486a(19) =553a(20) =638a(21) =726a(22) =820a(23) =887a(24) =1029a(25) =1152a(26) =1256a(27) =1376a(28) =1527a(29) =1659