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A112759 Total number of prime factors of n-th 5-smooth number. 7
0, 1, 1, 2, 1, 2, 3, 2, 2, 3, 2, 4, 3, 3, 4, 2, 3, 3, 5, 4, 4, 3, 5, 3, 4, 4, 6, 5, 3, 5, 4, 4, 6, 4, 5, 5, 3, 7, 4, 6, 4, 6, 5, 5, 7, 5, 6, 4, 6, 5, 4, 8, 5, 7, 5, 7, 6, 6, 4, 8, 6, 5, 7, 5, 7, 6, 5, 9, 6, 8, 6, 4, 8, 7, 5, 7, 6, 5, 9, 7, 6, 8, 6, 8, 7, 6, 10, 7, 5, 9, 7, 6, 5, 9, 8, 6, 8, 7, 6, 10, 8, 7, 9, 7 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..10000

FORMULA

a(n) = A001222(A051037(n));

a(n) = A112760(n) + A112761(n) + A112762(n).

MATHEMATICA

PrimeOmega @ Select[Range[3000], Last @ Map[First, FactorInteger[#]] <= 5 &] (* Amiram Eldar, Feb 07 2020 *)

CROSSREFS

Cf. A001222, A051037, A069352, A112754, A112758, A112760, A112761, A112762.

Sequence in context: A239507 A216448 A216763 * A309971 A096862 A029309

Adjacent sequences:  A112756 A112757 A112758 * A112760 A112761 A112762

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Sep 18 2005

STATUS

approved

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Last modified May 11 19:29 EDT 2021. Contains 343808 sequences. (Running on oeis4.)