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A131553
a(n) = product{1<=k<=n, GCD(k,n)=1} (1+k).
+0
1
2, 2, 6, 8, 120, 12, 5040, 384, 12960, 640, 39916800, 1152, 6227020800, 80640, 5443200, 10321920, 355687428096000, 290304, 121645100408832000, 38707200, 384758035200, 6812467200, 25852016738884976640000, 139345920
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Maintained by
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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
AT&T Labs Research
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