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Search: id:A061071
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| A061071 |
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Number of distinct values in the list of number of divisors, d(j), j=1...n. |
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+0
1
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| 1, 2, 2, 3, 3, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11
(list; graph; listen)
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OFFSET
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1,2
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REFERENCES
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P. Erdos and L. Mirsky, The distribution of values of the divisor function d(n), Proc. London Math. Soc., 2 (1952), 257-271.
B. Spearman and K. S. Williams, Handbook of Estimates in the Theory of Numbers, Carleton Math. Lecture Note Series No. 14, 1975; see p. 2.2.
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LINKS
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T. D. Noe, Table of n, a(n) for n=1..10000
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FORMULA
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a(n)=Length[Union[Table[DivisorSigma[0, w], {w, 1, n}]]]
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CROSSREFS
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A000005.
Sequence in context: A035486 A143489 A130249 this_sequence A122258 A068509 A070319
Adjacent sequences: A061068 A061069 A061070 this_sequence A061072 A061073 A061074
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), May 28 2001
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