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Search: id:A083288
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| A083288 |
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Sigma unitary-sigma perfect numbers: numbers n which satisfy the following equation for some integer k: sigma(usigma(n)) = k*n where usigma(n) is sum of unitary divisors of n. |
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| 1, 2, 9, 15, 18, 21, 40, 42, 60, 104, 120, 288, 312, 756, 1023, 1170, 2160, 2520, 3024, 4092, 6048, 6552, 8184, 17850, 18720, 29127, 30690, 40768, 58254, 79794, 147312
(list; graph; listen)
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