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Search: id:A090768
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| A090768 |
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4*7^(n^2+2n+1)*Product_{j=1..n} (49^j-1). |
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+0
7
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| 28, 460992, 18594942105600, 1801630225452634420838400, 419114092659655895262507217606410240000, 234094442205343557204838431982679810784254737891983360000, 313936710456644712932526713436974934772339799367593873556694922893983744000000, 1010846620958915523772074873493863525346718205399610275113597795065777917926818948851860049494016000000
(list; graph; listen)
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OFFSET
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0,1
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COMMENT
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The order of the p-Clifford group for an odd prime p is a*p^(n^2+2n+1)*Product_{j=1..n} (p^(2*j)-1), where a = gcd(p+1,4).
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LINKS
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G. Nebe, E. M. Rains and N. J. A. Sloane, Self-Dual Codes and Invariant Theory, Springer, Berlin, 2006.
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CROSSREFS
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Cf. A001309, A003956.
Cf. A092299 and A092301 (p=3), A092300 and A089989 (p=5), A090768 and A090769 (p=7), A090770 (p=2, although this is the wrong formula in that case).
Sequence in context: A085408 A119162 A047680 this_sequence A119180 A088844 A123269
Adjacent sequences: A090765 A090766 A090767 this_sequence A090769 A090770 A090771
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KEYWORD
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nonn
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AUTHOR
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njas, Feb 10 2004
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