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Search: id:A072417
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A072417 a(n) = smallest positive m such that m! contains exactly n 0's, or 0 if no such m exists. +0
2
1, 5, 7, 0, 12, 18, 19, 20, 22, 25, 28, 34, 37, 42, 48, 41, 38, 53, 51, 50, 57, 63, 67, 66, 76, 68, 61, 80, 82, 79, 83, 0, 77, 104, 89, 73, 85, 94, 110, 109, 118, 108, 107, 0, 116, 105, 131, 114, 129, 137, 128, 115, 122, 124, 127, 0, 134, 135, 144, 159, 140 (list; graph; listen)
OFFSET

0,2

EXAMPLE

a(1)=5: 5!=120, which has only 1 zero. Other numbers with only 1 zero are 6 and 9.

a(2)=7 since 7-th factorial i.e. 7!=5040 contains exactly two 0's.

a(3)=0 since no factorial contained just three zeros.

CROSSREFS

Cf. A072419.

Sequence in context: A019669 A088394 A021950 this_sequence A133412 A111833 A011378

KEYWORD

base,nonn

AUTHOR

Shyam Sunder Gupta (guptass(AT)rediffmail.com), Jul 31 2002

EXTENSIONS

Edited by njas, Sep 06 2008 at the suggestion of R. J. Mathar

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Last modified October 7 08:31 EDT 2008. Contains 144667 sequences.


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