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A086688
Number of primes < prime(n)^3.
2
4, 9, 30, 68, 217, 327, 656, 882, 1457, 2707, 3228, 5194, 6850, 7789, 9916, 13746, 18411, 20179, 26062, 30597, 32984, 40991, 46959, 56924, 72217, 80725, 85182, 94695, 99669, 110127, 152280, 165951, 187910, 195660, 237427, 246434, 274614
OFFSET
1,1
LINKS
FORMULA
a(n) = A038098(prime(n)). - R. J. Mathar, Sep 15 2012
a(n) = A000720(A030078(n)). - Michel Marcus, Sep 18 2023
MATHEMATICA
a[n_] := PrimePi[Prime[n]^3]; Array[a, 50] (* Amiram Eldar, Sep 06 2024 *)
PROG
(PARI) a(n) = primepi(prime(n)^3); \\ Michel Marcus, Sep 18 2023
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Cino Hilliard, Jul 28 2003
STATUS
approved