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A093464
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a(1) = 1; for n>1, a(n) = n*a(n-1) -1 if n is a prime else a(n) = n*a(n-1)+ 1.
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1
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1, 1, 2, 9, 44, 265, 1854, 14833, 133498, 1334981, 14684790, 176217481, 2290827252, 32071581529, 481073722936, 7697179566977, 130852052638608, 2355336947494945, 44751402002403954, 895028040048079081
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,3
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MATHEMATICA
| a[1] = 1; a[n_] := a[n] = (p = n*a[n - 1] - 1; If[ PrimeQ[n], p, p + 2]); Table[ a[n], {n, 20}] (from Robert G. Wilson v Apr 08 2004)
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CROSSREFS
| Cf. A093463.
Cf. A000166.
Sequence in context: A052881 A020071 A000166 * A196301 A184932 A073478
Adjacent sequences: A093461 A093462 A093463 * A093465 A093466 A093467
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KEYWORD
| nonn
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AUTHOR
| Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 05 2004
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EXTENSIONS
| More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 08 2004
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