A022337 - OEIS

A022337

Exponent of 5 (value of j) in n-th number of form 3^i*5^j.

0, 0, 1, 0, 1, 2, 0, 1, 2, 0, 3, 1, 2, 0, 3, 1, 4, 2, 0, 3, 1, 4, 2, 0, 5, 3, 1, 4, 2, 0, 5, 3, 1, 6, 4, 2, 0, 5, 3, 1, 6, 4, 2, 0, 7, 5, 3, 1, 6, 4, 2, 0, 7, 5, 3, 1, 8, 6, 4, 2, 0, 7, 5, 3, 1, 8, 6, 4, 2, 0, 9, 7, 5, 3, 1, 8, 6, 4, 2, 0, 9, 7, 5, 3, 1, 10, 8, 6, 4, 2, 0, 9, 7, 5, 3, 1, 10, 8, 6, 4, 2, 0, 11, 9, 7, 5

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OFFSET

1,6

LINKS

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

FORMULA

a(n) = A112765(A003593(n)) = A112754(n) - A022336(n). - Reinhard Zumkeller, Sep 18 2005

MATHEMATICA

s = {}; m = 12; Do[n = 5^k; While[n <= 5^m, AppendTo[s, n]; n *= 3], {k, 0, m}]; IntegerExponent[#, 5] & /@ Union[s] (* Amiram Eldar, Feb 06 2020 *)

CROSSREFS

Cf. A003593, A022336, A112754, A112762, A112765.

Sequence in context: A191530 A321435 A173863 * A025687 A025666 A025679

Adjacent sequences: A022334 A022335 A022336 * A022338 A022339 A022340

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved