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A246839 Number of trailing zeros in A002109(n). 2
0, 0, 0, 0, 0, 5, 5, 5, 5, 5, 15, 15, 15, 15, 15, 30, 30, 30, 30, 30, 50, 50, 50, 50, 50, 100, 100, 100, 100, 100, 130, 130, 130, 130, 130, 165, 165, 165, 165, 165, 205, 205, 205, 205, 205, 250, 250, 250, 250, 250, 350, 350, 350, 350, 350, 405, 405, 405, 405 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,6

LINKS

Chai Wah Wu, Table of n, a(n) for n = 0..999

PROG

(Python)

def a(n):

..s = 1

..for k in range(n+1):

....s *= k**k

..i = 1

..while not s % 10**i:

....i += 1

..return i-1

n = 1

while n < 100:

..print(a(n), end=', ')

..n += 1 # Derek Orr, Sep 04 2014

(Python)

from sympy import multiplicity

A246839, p5 = [0, 0, 0, 0, 0], 0

for n in range(5, 10**3, 5):

....p5 += multiplicity(5, n)*n

....A246839.extend([p5]*5)

# Chai Wah Wu, Sep 05 2014

CROSSREFS

Cf. A002109, A246817, A027868.

Sequence in context: A245357 A001735 A245101 * A077307 A181943 A243757

Adjacent sequences:  A246836 A246837 A246838 * A246840 A246841 A246842

KEYWORD

nonn,base

AUTHOR

Chai Wah Wu, Sep 04 2014

STATUS

approved

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Last modified July 5 23:36 EDT 2020. Contains 335475 sequences. (Running on oeis4.)