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A117762
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a(1)=6. a(n) = prime(n)*( (prime(n)^2-1 )/2 if n>1.
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1
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6, 12, 60, 168, 660, 1092, 2448, 3420, 6072, 12180, 14880, 25308, 34440, 39732, 51888, 74412, 102660, 113460, 150348, 178920, 194472, 246480, 285852, 352440, 456288
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Order of SL(2,prime(n)) groups.
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REFERENCES
| Blyth and Robertson, Essential Student Algebra, Volume 5: Groups,Chapman and Hall, New York, page 14
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FORMULA
| a(n) = A127918(n), n>1.
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MATHEMATICA
| f[n_] = If[Prime[n] - 2 == 0, 6, Prime[n]*(Prime[n]^2 - 1)/2] a = Table[f[n], {n, 1, 25}]
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CROSSREFS
| Sequence in context: A088944 A033931 A093901 * A178957 A104362 A123900
Adjacent sequences: A117759 A117760 A117761 * A117763 A117764 A117765
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KEYWORD
| nonn,easy
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AUTHOR
| Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Apr 14 2006
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