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
KEYWORD
nonn,base
AUTHOR
Chai Wah Wu, Sep 03 2014
STATUS
approved