

A117762


a(1)=6. a(n) = prime(n)*( (prime(n)^21 )/2 if n>1.


1



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
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OFFSET

1,1


COMMENTS

Order of SL(2,prime(n)) groups.


REFERENCES

Blyth and Robertson, Essential Student Algebra, Volume 5: Groups,Chapman and Hall, New York, page 14


LINKS

Table of n, a(n) for n=1..25.


FORMULA

a(n) = A127918(n), n>1.


MATHEMATICA

f[n_] = If[Prime[n]  2 == 0, 6, Prime[n]*(Prime[n]^2  1)/2] a = Table[f[n], {n, 1, 25}]


CROSSREFS

Sequence in context: A033931 A228847 A093901 * A178957 A104362 A123900
Adjacent sequences: A117759 A117760 A117761 * A117763 A117764 A117765


KEYWORD

nonn,easy


AUTHOR

Roger L. Bagula, Apr 14 2006


STATUS

approved



