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A111655
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n-th composite number appears n-th composite number times.
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5
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4, 4, 4, 4, 6, 6, 6, 6, 6, 6, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15
(list;
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refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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REFERENCES
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T. M. Apostol, Introduction to Analytic Number Theory, Springer-Verlag, 1976, page 2.
J. B. Rosser and L. Schoenfeld, Approximate formulas for some functions of prime numbers, Illinois J. Math. 6: 64-94 (1962).
L. Panaitopol, Some Properties of the Series of Composed [Composite] Numbers, J. Inequalities in Pure and Applied Mathematics. 2(2): Article 38, 2000.
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LINKS
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Table of n, a(n) for n=1..78.
Eric Weisstein's World of Mathematics, Composite Number."
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FORMULA
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A002808(n) appears A002808(n) times.
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CROSSREFS
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Cf. A002808, A111653, A111654.
Sequence in context: A140744 A179414 A139324 * A175961 A113646 A106325
Adjacent sequences: A111652 A111653 A111654 * A111656 A111657 A111658
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KEYWORD
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easy,nonn
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AUTHOR
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Jonathan Vos Post, Aug 12 2005
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STATUS
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approved
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