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Search: id:A107759
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| A107759 |
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(+2)UnitarySigma(n) : If n=Product p_i^r_i then (+2)Sigma(n)=Product (2+p_i^r_i), (+2)UnitarySigma(1)=1. |
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| 1, 4, 5, 6, 7, 20, 9, 10, 11, 28, 13, 30, 15, 36, 35, 18, 19, 44, 21, 42
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