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Search: id:A110377
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| A110377 |
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SUM (n!/r!) where r is relatively prime to n and less than n. |
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+0
3
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| 1, 2, 9, 28, 205, 726, 8659, 47384, 562545, 4234330, 68588311, 483088332, 10699776685, 102434734598, 2016289908585, 24588487650736, 611171244308689, 6456997293606738, 209020565553571999, 2838875160624256460
(list; graph; listen)
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OFFSET
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1,2
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EXAMPLE
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a(6) = 6!{1/1! +1/5!}=726.
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MAPLE
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a:=proc(n) local s, r: s:=0: for r from 1 to n do if gcd(r, n)=1 then s:=s+1/r! else s:=s: fi: od: n!*s end: seq(a(n), n=1..23); (Deutsch)
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CROSSREFS
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Cf. A110373, A110374, A038048, A110276.
Sequence in context: A086511 A138912 A002747 this_sequence A041877 A090208 A123058
Adjacent sequences: A110374 A110375 A110376 this_sequence A110378 A110379 A110380
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KEYWORD
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easy,nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Jul 24 2005
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EXTENSIONS
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More terms from Emeric Deutsch (deutsch(AT)duke.poly.edu), Jul 25 2005
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