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Search: id:A056550
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| A056550 |
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Numbers n such that Sum_{k=1..n} sigma(k) is divisible by n, where sigma(k) = sum of divisors of k (A000203). |
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+0 2
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| 1, 2, 8, 11, 17, 63, 180, 259, 818, 2161, 4441, 8305, 11998, 694218, 3447076, 4393603, 57402883, 73459800
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