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A153818 a(n)=Sum_{k=1..n} floor(n^2/k^2) +0
3
1, 5, 12, 22, 35, 53, 72, 96, 123, 153, 184, 222, 260, 304, 351, 402, 453, 510, 568, 633, 697, 765, 839, 916, 994, 1077, 1164, 1252, 1342, 1443, 1535, 1641, 1747, 1856, 1969, 2083, 2200, 2321, 2447, 2579, 2705, 2844, 2979, 3123, 3269, 3417, 3570, 3726, 3881 (list; graph; listen)
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Last modified December 4 23:11 EST 2009. Contains 170347 sequences.


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