login
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
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 *)
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Sep 18 2005
STATUS
approved