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Search: id:A095997
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| A095997 |
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Number of divisors of n! that are coprime to n. |
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+0
1
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| 1, 1, 2, 2, 8, 2, 30, 12, 32, 10, 270, 12, 792, 72, 144, 336, 5376, 96, 14688, 432, 1520, 1600, 96000, 960, 48576, 7392, 48384, 7056, 917280, 720, 2332800, 172800, 122880
(list; graph; listen)
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OFFSET
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1,3
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COMMENT
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a(p_i) < a(p_j) for i<j.
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MATHEMATICA
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f[n_] := Length[ Select[ Divisors[n! ], GCD[ #, n] == 1 &]]; Table[ f[n], {n, 33}]
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CROSSREFS
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Sequence in context: A098984 A088560 A086328 this_sequence A056189 A121860 A021442
Adjacent sequences: A095994 A095995 A095996 this_sequence A095998 A095999 A096000
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KEYWORD
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nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Jul 19 2004, based on a suggestion from Leroy Quet, Jun 18 2004
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