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Search: id:A093464
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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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2
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| 1, 1, 2, 9, 44, 265, 1854, 14833, 133498, 1334981, 14684790, 176217481, 2290827252, 32071581529, 481073722936, 7697179566977, 130852052638608, 2355336947494945, 44751402002403954, 895028040048079081
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OFFSET
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1,3
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MATHEMATICA
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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
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Cf. A093463.
Cf. A000166.
Sequence in context: A052881 A020071 A000166 this_sequence A073478 A088369 A059388
Adjacent sequences: A093461 A093462 A093463 this_sequence A093465 A093466 A093467
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KEYWORD
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nonn
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AUTHOR
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Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Apr 05 2004
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EXTENSIONS
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More terms from Robert G. Wilson v (rgwv(AT)rgwv.com), Apr 08 2004
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