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Search: id:A126849
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| A126849 |
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PrimePowerSigma(n)=Sum_{d|n, r_j are prime} d =Product_i (Sum_{2<=s_i<=r_i, s_i are prime} p_i^s_i where n=Product_i p_i^r_i, d=Product_j p_j^r_j. |
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2
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| 1, 0, 0, 4, 0, 0, 0, 12, 0, 0, 0, 4
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