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Search: id:A072163
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| A072163 |
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a(n)-th factorial is the smallest factorial containing exactly n 2's, or 0 if no such number exists. |
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+0
9
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| 2, 14, 13, 30, 40, 47, 31, 46, 54, 49, 65, 76, 62, 69, 107, 78, 86, 115, 95, 121, 109, 165, 110, 113, 149, 151, 146, 137, 162, 159, 170, 191, 195, 174, 190, 196, 164, 209, 202, 173, 198, 248, 201, 262, 231, 205, 263, 233, 246, 256, 270, 244, 287, 200, 271, 250
(list; graph; listen)
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OFFSET
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1,1
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EXAMPLE
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a(2)=14 since 14-th factorial i.e. 14!=87178291200 contains exactly two 2's.
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MATHEMATICA
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Do[k = 1; While[ Count[IntegerDigits[k! ], 2] != n, k++ ]; Print[k], {n, 1, 60}]
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CROSSREFS
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Cf. A072293, A072220, A072208, A072204, A072200, A072199, A072178, A072177 & A072124.
Sequence in context: A084677 A082609 A158787 this_sequence A084674 A009774 A032933
Adjacent sequences: A072160 A072161 A072162 this_sequence A072164 A072165 A072166
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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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