OFFSET
0,2
LINKS
David Baugh, Table of n, a(n) for n = 0..33 (terms n = 29..33 found using Kim Walisch's primecount program)
FORMULA
MATHEMATICA
Table[PrimePi[6^n], {n, 0, 17}]
PROG
(PARI) a(n) = primepi(6^n); \\ Michel Marcus, Oct 05 2020
CROSSREFS
KEYWORD
nonn
AUTHOR
Robert G. Wilson v, Jun 09 2000
EXTENSIONS
a(18)-a(24) from Henri Lifchitz, Nov 11 2012
a(25)-a(28) from Henri Lifchitz, Aug 25 2014
STATUS
approved