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A099631
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Numbers n such that (sigma[n-2]+sigma[n+2])/2 = sigma[n].
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2
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5, 8, 32, 44, 116, 184, 356, 764, 815, 1004, 1012, 1205, 1338, 1345, 1436, 2636, 2876, 3126, 3644, 5156, 5305, 5804, 6236, 7192, 7542, 7556, 8564, 9356, 9404, 10196, 10362, 10904, 11276, 11876, 13436, 16375, 17564, 17636, 20156, 25316, 25964
(list; graph; refs; listen; history; internal format)
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