**a(n) = sum_{k=1..n} k*floor(n/k); also sum_{k=1..n} sigma(k) where sigma(n) = sum of divisors of n (A000203).**

*1, 4, 8, 15, 21, 33, 41, 56, 69, 87, 99, 127, 141, 165, 189, 220, 238, 277, 297, 339*

*2 seqfan posts*

Index of A-numbers in seqfan: by ascending order by month by frequency by keyword

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