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Search: id:A019286
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| A019286 |
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Let sigma_m (n) be result of applying sum-of-divisors function m times to n; call n (m,k)-perfect if sigma_m (n) = k*n; sequence gives the (2,9)-perfect numbers. |
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| 168, 10752, 331520, 691200, 1556480, 1612800, 106151936
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