A022333 Exponent of 5 (value of j) in n-th number of form 2^i*5^j.

0, 0, 0, 1, 0, 1, 0, 1, 2, 0, 1, 2, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 4, 1, 2, 3, 0, 4, 1, 2, 3, 0, 4, 1, 5, 2, 3, 0, 4, 1, 5, 2, 3, 0, 4, 1, 5, 2, 6, 3, 0, 4, 1, 5, 2, 6, 3, 0, 4, 1, 5, 2, 6, 3, 0, 7, 4, 1, 5, 2, 6, 3, 0, 7, 4, 1, 5, 2, 6, 3, 0, 7, 4, 1, 8, 5, 2, 6, 3, 0, 7, 4, 1, 8, 5, 2, 6, 3, 0, 7, 4, 1, 8, 5, 2

Offset

1,9

Links

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

Formula

a(n) = A112765(A003592(n)). - Amiram Eldar, Feb 07 2020

Maple

A022333 := proc(n)
    A112765(A003592(n)) ;
end proc:
seq(A022333(n), n=1..20) ; # R. J. Mathar, Aug 04 2016

Mathematica

s = {}; m = 12; Do[n = 5^k; While[n <= 5^m, AppendTo[s, n]; n *= 2], {k, 0, m}]; IntegerExponent[#, 5] & /@ Union[s]

Prog

(PARI) lista(nn) = {vec = vector(nn, i , i); subset = select(n->(n/(2^valuation(n, 2)*5^valuation(n, 5)) == 1), vec); for (i = 1, #subset, print1(valuation(subset[i], 5), ", "); ); } \\ Michel Marcus, Oct 01 2013

Crossrefs

Cf. A003592, A022332, A112765.

Sequence in context: A025850 A096771 A129714 * A055087 A025685 A194515

Adjacent sequences: A022330 A022331 A022332 * A022334 A022335 A022336

Keyword

nonn

Author

Clark Kimberling

Status

approved