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A067680
Numbers n such that sigma(2n+2)=4n.
+0
1
6, 21, 54, 75, 441, 1071, 4191, 9315, 58311, 4197375, 7685151, 36997695, 268460031, 1073790975, 17180065791
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Maintained by
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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.
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