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A111653
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n-th composite number appears n times.
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4
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4, 6, 6, 8, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 10, 12, 12, 12, 12, 12, 12, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16, 16, 18, 18, 18, 18, 18, 18, 18, 18, 18, 18, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21, 21, 21, 21, 21, 21, 21
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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REFERENCES
| 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 Numbers, J. Inequalities in Pure and Applied Mathematics. 2(2): Article 38, 2000.
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LINKS
| Eric Weisstein's World of Mathematics, Composite Number."
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FORMULA
| A002808(n) appears n times.
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CROSSREFS
| Cf. A002808, A111654, A111655.
Sequence in context: A200118 A074672 A070259 * A173395 A049089 A028327
Adjacent sequences: A111650 A111651 A111652 * A111654 A111655 A111656
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KEYWORD
| easy,nonn
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AUTHOR
| Jonathan Vos Post (jvospost3(AT)gmail.com), Aug 12 2005
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