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Search: id:A110379
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| A110379 |
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SUM (n!/c!) where c is a composite number <=n. |
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+0
1
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| 1, 5, 31, 217, 1737, 15634, 156341, 1719751, 20637013, 268281169, 3755936367, 56339045506, 901424728097, 15324220377649, 275835966797683, 5240883369155977, 104817667383119541, 2201171015045510362
(list; graph; listen)
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OFFSET
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4,2
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EXAMPLE
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a(6) = 6!{1/4! +1/6!}=31.
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MAPLE
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a:=proc(n) local s, i :s:=0: for i from 4 to n do if isprime(i)=false then s:=s+1/i! else s:=s: fi od: n!*s; end; seq(a(n), n=4..24); (Deutsch)
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CROSSREFS
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Cf. A110373, A110374, A038048, A110376, A110377, A110378.
Sequence in context: A146962 A036758 A153232 this_sequence A097146 A143020 A059035
Adjacent sequences: A110376 A110377 A110378 this_sequence A110380 A110381 A110382
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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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