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A027687
Quadruply-perfect numbers: sum of divisors of n is 4n.
+0
13
30240, 32760, 2178540, 23569920, 45532800, 142990848, 1379454720, 43861478400, 66433720320
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.
AT&T Labs Research
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