Number of primes less than 1000n.

Terms

a(0) =168a(1) =303a(2) =430a(3) =550a(4) =669a(5) =783a(6) =900a(7) =1007a(8) =1117a(9) =1229a(10) =1335a(11) =1438a(12) =1547a(13) =1652a(14) =1754a(15) =1862a(16) =1960a(17) =2064a(18) =2158a(19) =2262a(20) =2360a(21) =2464a(22) =2564a(23) =2668a(24) =2762a(25) =2860a(26) =2961a(27) =3055a(28) =3153a(29) =3245