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Search: id:A072199
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| A072199 |
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a(n)-th factorial is the smallest factorial containing exactly n 5's, or 0 if no such number exists. |
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+0
9
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| 7, 17, 25, 30, 37, 41, 43, 46, 75, 65, 55, 83, 74, 80, 94, 116, 91, 114, 131, 111, 115, 136, 147, 125, 128, 143, 102, 169, 152, 157, 197, 150, 165, 185, 193, 190, 206, 198, 192, 214, 236, 203, 242, 226, 205, 256, 251, 220, 270, 239, 230, 261, 286, 222, 264
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OFFSET
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1,1
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EXAMPLE
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a(2)=17 since 17-th factorial i.e. 17!=355687428096000 contains exactly two 5's.
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MATHEMATICA
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Do[k = 1; While[ Count[IntegerDigits[k! ], 5] != n, k++ ]; Print[k], {n, 1, 60}]
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CROSSREFS
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Cf. A072242, A072220, A072208, A072204, A072200, A072178, A072177, A072163 & A072124.
Sequence in context: A026349 A057183 A076293 this_sequence A067873 A011537 A043517
Adjacent sequences: A072196 A072197 A072198 this_sequence A072200 A072201 A072202
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KEYWORD
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base,nonn
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AUTHOR
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Shyam Sunder Gupta (guptass(AT)rediffmail.com), Jul 30 2002
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EXTENSIONS
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Edited and extended by Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 31 2002
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