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Search: id:A117735
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| 0, 0, 0, 0, 18, 90, 690, 4830, 40110, 362670, 3628590, 39914490, 478999290, 6226990770, 87178261170, 1307674337970, 20922789857970, 355687427585490, 6402373705217490, 121645100399132310, 2432902008166940310
(list; graph; listen)
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OFFSET
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0,5
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FORMULA
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a(n) =n!-A034386[n]
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MATHEMATICA
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f[n_] := If[PrimeQ[n] == True, 1, n] cf[0] = 1; cf[n_Integer?Positive] := cf[n] = f[n]*cf[n - 1] g[n_] := If[PrimeQ[n] == True, n, 1] p[0] = 1; p[n_Integer?Positive] := p[n] = g[n]*p[n - 1] Table[n! - p[n], {n, 0, 20}]
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CROSSREFS
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Cf. A034386, A117683.
Sequence in context: A063788 A066854 A059138 this_sequence A041624 A034725 A047929
Adjacent sequences: A117732 A117733 A117734 this_sequence A117736 A117737 A117738
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KEYWORD
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nonn,uned,probation
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AUTHOR
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Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Apr 14 2006
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