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A051281
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Sum of divisors of n, sigma(n) (A000203), is a power of number of divisors of n, d(n) (A000005).
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0
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1, 3, 7, 31, 127, 217, 889, 2667, 3937, 8191, 27559, 57337, 131071, 172011, 253921, 524287, 917497, 1040257, 1777447, 3670009, 4063201, 11010027, 12189603, 16252897, 16646017, 66584449, 113770279, 116522119, 225735769
(list; graph; refs; listen; history; internal format)
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