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Search: id:A048657
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| A048657 |
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Number of non-unitary divisors of n!. |
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+0
5
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| 0, 0, 0, 4, 8, 22, 44, 80, 144, 254, 508, 760, 1520, 2528, 3968, 5312, 10624, 14560, 29120, 40784, 60544, 95744, 191488, 242368, 339520, 531712, 676864, 916768, 1833536, 2331776, 4663552, 5527552, 7862272, 12163072, 16420864, 19593472
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OFFSET
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1,4
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EXAMPLE
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n=5, 5!=120 has 16 divisors of which 8 are not unitary:{2,60,4,30,6,20,10,12} while {1,120,3,40,5,24,15,16} are the unitary ones.
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CROSSREFS
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A000005(n!) - 2^(A000720(n)). Cf. A027423, A034444, A048656.
Sequence in context: A064503 A050482 A003606 this_sequence A000639 A052528 A058855
Adjacent sequences: A048654 A048655 A048656 this_sequence A048658 A048659 A048660
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu)
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