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A055729 Number of primes <= 3^n. 2
0, 2, 4, 9, 22, 53, 129, 327, 847, 2227, 5968, 16097, 43934, 120739, 334349, 931260, 2607165, 7332159, 20700806, 58648288, 166677978, 475023803, 1357200840, 3886548158, 11152818693, 32064929886, 92349038518, 266398236486 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

LINKS

Index entries for sequences related to numbers of primes in various ranges

MATHEMATICA

Table[PrimePi[3^n], {n, 0, 29}]

CROSSREFS

Cf. A006880 and A007053.

Sequence in context: A057580 A129875 A055094 * A048211 A098719 A198520

Adjacent sequences:  A055726 A055727 A055728 * A055730 A055731 A055732

KEYWORD

nonn

AUTHOR

Robert G. Wilson v (rgwv(AT)rgwv.com), Jun 09 2000

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Last modified February 17 21:13 EST 2012. Contains 206085 sequences.