A024623 - OEIS

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A024623

a(n) is the number of prime powers <= 3^n.

2

1, 3, 8, 16, 33, 69, 153, 360, 894, 2294, 6060, 16229, 44126, 121021, 334771, 931905, 2608160, 7333717, 20703268, 58652234, 166684333, 475034096, 1357217584, 3886575564, 11152863757, 32065004164, 92349161271, 266398439961, 769616851854, 2226457643329, 6449248612381, 18703413267318

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OFFSET

0,2

COMMENTS

a(n) is the position of 3^n among the powers of primes (A000961). - Robert G. Wilson v, Dec 16 2019

LINKS

David A. Corneth, Table of n, a(n) for n = 0..47 (calculated using the bfile in A055729)

FORMULA

a(n) = A065515(3^n). - Michel Marcus, Dec 15 2019

CROSSREFS

Cf. A000961 (powers of primes), A000244 (powers of 3), A055729, A065515.

Sequence in context: A173283 A077552 A171497 * A337118 A344509 A201250

Adjacent sequences: A024620 A024621 A024622 * A024624 A024625 A024626

KEYWORD

nonn

AUTHOR

Clark Kimberling

EXTENSIONS

a(18)-a(31) from Robert G. Wilson v, Dec 15 2019

STATUS

approved