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Search: id:A123906
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| A123906 |
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a(n) = n-th integer from among those positive integers with at least n positive divisors. |
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+0
1
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| 1, 3, 8, 12, 24, 30, 54, 56, 100, 120, 144, 150, 288, 300, 324, 360, 560, 576, 756, 780, 990, 1020, 1050, 1056, 1980, 2040, 2100, 2184, 2352, 2376, 2808, 2856, 3900, 3960, 4032, 4080, 6000, 6048, 6120, 6160, 7980, 8064, 8400, 8568, 8580, 9000, 9072, 9120
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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The sequence of positive integers, each with 4 or more positive divisors, begins: 6,8,10,12,14,... The 4th of these is 12, so a(4) = 12.
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MATHEMATICA
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f[n_] := Block[{k = 0, c = n}, While[c > 0, k++; While[Length@Divisors[k] < n, k++ ]; c--; ]; k]; Table[f[n], {n, 50}] (*Chandler*)
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CROSSREFS
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Sequence in context: A022407 A007434 A128303 this_sequence A065970 A024463 A092954
Adjacent sequences: A123903 A123904 A123905 this_sequence A123907 A123908 A123909
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KEYWORD
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nonn
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AUTHOR
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Leroy Quet (q1qq2qqq3qqqq(AT)yahoo.com), Oct 28 2006
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EXTENSIONS
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Extended by Ray Chandler (rayjchandler(AT)sbcglobal.net), Nov 13 2006
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