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Search: id:A061203
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| 1, 6, 11, 26, 31, 56, 61, 96, 111, 136, 141, 216, 221, 246, 271, 341, 346, 421, 426, 501, 526, 551, 556, 731, 746, 771, 806, 881, 886, 1011, 1016, 1142, 1167, 1192, 1217, 1442, 1447, 1472, 1497, 1672, 1677, 1802, 1807, 1882, 1957, 1982, 1987, 2337, 2352
(list; graph; listen)
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OFFSET
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1,2
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COMMENT
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(tau<=)_k(n) = |{(x_1,x_2,...,x_k): x_1*x_2*...*x_k<=n}|, i.e. (tau<=)_k(n) is number of solutions to x_1*x_2*...*x_k<=n, x_i>0.
Equals row sums of triangle A140705. - Gary W. Adamson (qntmpkt(AT)yahoo.com), May 24 2008
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FORMULA
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(tau<=)_k(n)=Sum_{i=1..n} tau_k(i). a(n)=partial sums of A061200.
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CROSSREFS
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Cf. tau_2(n): A000005, tau_3(n): A007425, tau_4(n): A007426, tau_5(n): A061200, tau_6(n): A034695, (unordered) 2-factorizations of n: A038548, (unordered) 3-factorizations of n: A034836, A001055, (tau<=)_2(n): A006218, (tau<=)_3(n): A061201, (tau<=)_4(n): A061202, (tau<=)_6(n): A061204.
Cf. A140705.
Adjacent sequences: A061200 A061201 A061202 this_sequence A061204 A061205 A061206
Sequence in context: A063629 A093027 A109296 this_sequence A140359 A136979 A007433
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KEYWORD
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easy,nonn
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AUTHOR
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Vladeta Jovovic (vladeta(AT)Eunet.yu), Apr 21 2001
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