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A144922
Numbers n such that n*sigma_2(n)/sigma_1(n) is an integer
+0
1
1, 4, 6, 9, 12, 16, 18, 20, 24, 25, 28, 36, 44, 45, 48, 49, 50, 54, 60, 64, 72, 81, 90, 92, 96, 100, 108, 112, 117, 121, 132, 140, 144, 150, 153, 162, 168, 169, 180, 192, 196
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Maintained by
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Last modified December 5 20:25 EST 2009. Contains 170428 sequences.
AT&T Labs Research
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