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A096060
(2^(p-1)-1)/(3*p) where p = prime(n).
+0
2
1, 3, 31, 105, 1285, 4599, 60787, 3085465, 11545611, 619094385, 8939118925, 34093383807, 499069107643, 28324525958305, 1628420204246959, 6300117511512825, 367099384551433863, 5542683665339959171
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.
AT&T Labs Research
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