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A112764 Greatest prime factor of the n-th 5-smooth number. 4
1, 2, 3, 2, 5, 3, 2, 3, 5, 3, 5, 2, 3, 5, 3, 5, 3, 5, 2, 3, 5, 5, 3, 5, 3, 5, 2, 3, 5, 5, 3, 5, 3, 5, 3, 5, 5, 2, 5, 3, 5, 5, 3, 5, 3, 5, 3, 5, 5, 3, 5, 2, 5, 3, 5, 5, 3, 5, 5, 3, 5, 5, 3, 5, 5, 3, 5, 2, 5, 3, 5, 5, 5, 3, 5, 5, 3, 5, 3, 5, 5, 3, 5, 5, 3, 5, 2, 5, 5, 3, 5, 5, 5, 5, 3, 5, 5, 3, 5, 3, 5, 5, 3, 5, 5 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

FORMULA

a(n) = A006530(A051037(n));

A112763(n) <= a(n) <= 5.

MATHEMATICA

Reap[Do[p = FactorInteger[n][[-1, 1]]; If[p < 7, Sow[p]], {n, 1, 2000}] ][[2, 1]] (* Jean-Fran├žois Alcover, Dec 17 2017 *)

PROG

(MAGMA) [1] cat [Max(PrimeDivisors(k)): k in [2..1500]| PrimeDivisors(k) subset [2, 3, 5]]; // Marius A. Burtea, Feb 07 2020

CROSSREFS

Cf. A051037, A006530, A086411, A112756, A112763.

Sequence in context: A007967 A054494 A306252 * A108728 A331962 A302170

Adjacent sequences:  A112761 A112762 A112763 * A112765 A112766 A112767

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Sep 18 2005

STATUS

approved

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Last modified May 8 09:21 EDT 2021. Contains 343666 sequences. (Running on oeis4.)