A246817 Possible number of trailing zeros in hyperfactorials (A002109).

0, 5, 15, 30, 50, 100, 130, 165, 205, 250, 350, 405, 465, 530, 600, 750, 830, 915, 1005, 1100, 1300, 1405, 1515, 1630, 1750, 2125, 2255, 2390, 2530, 2675, 2975, 3130, 3290, 3455, 3625, 3975, 4155, 4340, 4530, 4725, 5125, 5330, 5540, 5755, 5975, 6425, 6655

Offset

1,2

Comments

The number of trailing zeros in A002109 increases every 5 terms since the exponent of the factor 5 increases every 5 terms and the exponent of the factor 2 increases every 2 terms.

Links

Chai Wah Wu, Table of n, a(n) for n = 1..1000

Prog

(Python)
from sympy import multiplicity
A246817, p5 = [0], 0
for n in range(5, 5*10**3, 5):
....p5 += multiplicity(5, n)*n
....A246817.append(p5) # Chai Wah Wu, Sep 05 2014

Crossrefs

Cf. A002109, A191610, A246839.

Sequence in context: A028895 A194150 A341065 * A010898 A048065 A048021

Adjacent sequences: A246814 A246815 A246816 * A246818 A246819 A246820

Keyword

nonn,base

Author

Chai Wah Wu, Sep 03 2014

Status

approved