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A071973 Number of primes less than or equal to Pi^n. 2
0, 2, 4, 11, 25, 62, 162, 433, 1175, 3229, 9042, 25549, 73050, 210356, 610041, 1779830, 5218745, 15372304, 45455747, 134882577, 401480918, 1198344171, 3585783711, 10754085805, 32319203663, 97312548674, 293515297707, 886720888966, 2682778745396, 8127887397064 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
David Baugh, Table of n, a(n) for n = 0..52 (terms n = 27..52 found using Kim Walisch's primecount program)
FORMULA
a(n) = A000720(A001672(n)). - Michel Marcus, Oct 05 2020
MATHEMATICA
Do[ Print[ PrimePi[Pi^n]], {n, 0, 28}]
PROG
(PARI) a(n) = primepi(Pi^n); \\ Michel Marcus, Oct 05 2020
CROSSREFS
Sequence in context: A131434 A100550 A329707 * A086424 A122121 A368412
KEYWORD
hard,nonn
AUTHOR
Robert G. Wilson v, Jun 18 2002
EXTENSIONS
a(27)-a(29) from David Baugh, Oct 05 2020
STATUS
approved

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Last modified April 18 16:22 EDT 2024. Contains 371780 sequences. (Running on oeis4.)