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A005820
Triply perfect (tri-perfect, or triperfect) numbers: sum of divisors of n is 3n.
(Formerly M5376)
+0
16
120, 672, 523776, 459818240, 1476304896, 51001180160
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Maintained by
N. J. A. Sloane
(
njas@research.att.com
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Last modified December 15 00:47 EST 2009. Contains 170825 sequences.
AT&T Labs Research
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