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 A111657 n-th composite number appears n-th prime times. 1
 4, 4, 6, 6, 6, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 12, 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, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 REFERENCES T. M. Apostol, Introduction to Analytic Number Theory, Springer-Verlag, 1976, page 2. L. Panaitopol, Some Properties of the Series of Composed [Composite] Numbers, J. Inequalities in Pure and Applied Mathematics. 2(2): Article 38, 2000. J. B. Rosser and L. Schoenfeld, Approximate formulas for some functions of prime numbers, Illinois J. Math. 6: 64-94 (1962). LINKS Eric Weisstein's World of Mathematics, Composite Number." Eric Weisstein's World of Mathematics, Prime Number." FORMULA A002808(n) appears A000040(n) times. CROSSREFS Cf. A000040, A002808, A111653, A111654, A111655, A111656. Sequence in context: A019559 A274636 A198697 * A049751 A196594 A190303 Adjacent sequences:  A111654 A111655 A111656 * A111658 A111659 A111660 KEYWORD easy,nonn AUTHOR Jonathan Vos Post, Aug 12 2005 STATUS approved

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Last modified January 23 20:03 EST 2022. Contains 350515 sequences. (Running on oeis4.)