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A091286
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Numbers n such that Sigma[3,n] is divisible by square of cototient of n, while n is not a prime number.
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0
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15, 85, 259, 295, 391, 589, 799, 1111, 1717, 3193, 4171, 4369, 12361, 17473, 23533, 25429, 28243, 31351, 34477, 36181, 41407, 47989, 51143, 52537, 58103, 65641, 68377, 69541, 69919, 70453, 72619, 81121, 83131, 83767, 85069, 91759
(list; graph; refs; listen; history; internal format)
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