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A067065
Numbers n such that sigma(sigma(sigma(n)))) == 6*sigma(n).
+0
1
20, 26, 41, 44, 65, 83, 132, 133, 140, 182, 188, 195, 249, 287, 299, 420, 546, 564, 620, 644, 764, 806, 861, 897, 1001, 1115, 1169, 1271, 28644, 32172, 35052, 39116
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Maintained by
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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.
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