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A068401
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Numbers n such that sigma(n)=phi(n+1)+phi(n-1).
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0
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2, 38, 62, 346, 1298, 7898, 22682, 24382, 93022, 108194, 143362, 171982, 192718, 264766, 587638, 986642, 1236898, 1441042, 1604422, 2228582, 4146434, 5070314, 5631718, 6687046, 10223918, 10695182, 12465158
(list; graph; refs; listen; history; internal format)
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