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A103289
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Numbers n such that both sigma(n)>=2n-1 and sigma(n+1)>=2(n+1)-1.
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4
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1, 4095, 5775, 5984, 7424, 11024, 21735, 21944, 26144, 27404, 39375, 43064, 49664, 56924, 58695, 61424, 69615, 70784, 76544, 77175, 79695, 81080, 81675, 82004, 84524, 84644, 89775, 91664, 98175, 103455, 104895, 106784, 109395, 111824
(list; graph; refs; listen; history; internal format)
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