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A112761 Exponent of 3 (value of j) in n-th number of the form 2^i*3^j*5^k. 6
0, 0, 1, 0, 0, 1, 0, 2, 0, 1, 1, 0, 2, 0, 1, 0, 3, 1, 0, 2, 0, 2, 1, 0, 3, 1, 0, 2, 1, 0, 4, 2, 1, 0, 3, 1, 0, 0, 3, 2, 1, 0, 4, 2, 1, 0, 3, 2, 1, 5, 0, 0, 3, 2, 1, 0, 4, 2, 1, 1, 0, 4, 3, 2, 1, 5, 0, 0, 3, 2, 1, 0, 0, 4, 3, 2, 6, 1, 1, 0, 4, 3, 2, 1, 5, 0, 0, 3, 2, 2, 1, 5, 0, 0, 4, 3, 2, 6, 1, 1, 0, 4, 3, 2, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,8
LINKS
FORMULA
a(n) = A007949(A051037(n));
a(n) = A112759(n) - A112760(n) - A112762(n).
MATHEMATICA
IntegerExponent[#, 3] & /@ Select[Range[3000], Last @ Map[First, FactorInteger[#]] <= 5 &] (* Amiram Eldar, Feb 07 2020 *)
CROSSREFS
Sequence in context: A271368 A116799 A057556 * A284320 A281271 A284319
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Sep 18 2005
STATUS
approved

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Last modified April 23 05:35 EDT 2024. Contains 371906 sequences. (Running on oeis4.)