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A067781
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Numbers n such that phi(n) and sigma(n) are simultaneously perfect squares.
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1
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1, 170, 364, 679, 5044, 5130, 5670, 5770, 8721, 8736, 9154, 9639, 9809, 14322, 16376, 22413, 27783, 30256, 32025, 37114, 38760, 51455, 71604, 78570, 82615, 88392, 92004, 100821, 101153, 104168, 115430, 121056, 133569, 139954, 148568
(list; graph; refs; listen; history; internal format)
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