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A056917
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Numbers n such that sigma(n)-phi(n) is a perfect square.
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1
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1, 15, 30, 44, 65, 77, 78, 87, 105, 141, 147, 186, 242, 247, 282, 301, 330, 335, 345, 450, 481, 560, 570, 589, 591, 606, 671, 705, 717, 767, 777, 785, 819, 820, 870
(list; graph; refs; listen; history; internal format)
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