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Search: id:A110374
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| A110374 |
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SUM (n!/c) where c is a composite number <=n. |
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+0
7
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| 6, 30, 300, 2100, 21840, 236880, 2731680, 30048480, 400498560, 5206481280, 79117758720, 1273944672000, 21690789120000, 368743415040000, 6993068898816000, 132868309077504000, 2779011281958912000
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OFFSET
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4,1
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EXAMPLE
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a(8) = 8!{1/4 +1/6 +1/8}=21840.
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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..23); (Deutsch)
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CROSSREFS
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Cf. A110373.
Sequence in context: A051821 A099031 A066108 this_sequence A111876 A119634 A075591
Adjacent sequences: A110371 A110372 A110373 this_sequence A110375 A110376 A110377
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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 24 2005
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