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A112760
Exponent of 2 (value of i) in n-th number of the form 2^i*3^j*5^k.
5
0, 1, 0, 2, 0, 1, 3, 0, 1, 2, 0, 4, 1, 2, 3, 0, 0, 1, 5, 2, 3, 0, 4, 1, 1, 2, 6, 3, 0, 4, 0, 1, 5, 2, 2, 3, 0, 7, 0, 4, 1, 5, 1, 2, 6, 3, 3, 0, 4, 0, 1, 8, 1, 5, 2, 6, 2, 3, 0, 7, 4, 0, 4, 1, 5, 1, 2, 9, 2, 6, 3, 0, 7, 3, 0, 4, 0, 1, 8, 5, 1, 5, 2, 6, 2, 3, 10, 3, 0, 7, 4, 0, 1, 8, 4, 1, 5, 1, 2, 9, 6, 2, 6, 3, 0
OFFSET
1,4
LINKS
FORMULA
a(n) = A007814(A051037(n));
a(n) = A112759(n) - A112761(n) - A112762(n).
MATHEMATICA
IntegerExponent[#, 2] & /@ Select[Range[3000], Last @ Map[First, FactorInteger[#]] <= 5 &] (* Amiram Eldar, Feb 07 2020 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Sep 18 2005
STATUS
approved