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Search: id:A072124
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| A072124 |
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a(n)-th factorial is the smallest factorial containing exactly n 1's, or 0 if no such number exists. |
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+0
9
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| 1, 14, 19, 25, 32, 40, 33, 60, 63, 47, 68, 64, 74, 87, 79, 73, 97, 110, 107, 132, 134, 129, 116, 136, 123, 113, 145, 143, 160, 180, 153, 171, 185, 176, 224, 209, 196, 207, 229, 221, 211, 167, 236, 252, 260, 201, 235, 274, 249, 231, 246, 284, 199, 273, 294, 267
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OFFSET
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1,2
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EXAMPLE
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a(2)=14 since 14-th factorial i.e. 14!=87178291200 contains exactly two 1's.
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MATHEMATICA
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Do[k = 1; While[ Count[IntegerDigits[k! ], 1] != n, k++ ]; Print[k], {n, 1, 60}]
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CROSSREFS
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Cf. A072295, A072220, A072208, A072204, A072200, A072199, A072178, A072177 & A072163.
Sequence in context: A013649 A013657 A013653 this_sequence A026287 A028396 A120158
Adjacent sequences: A072121 A072122 A072123 this_sequence A072125 A072126 A072127
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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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