%I A111653
%S A111653 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,
%T A111653 14,15,15,15,15,15,15,15,15,16,16,16,16,16,16,16,16,16,18,18,18,18,18,
%U A111653 18,18,18,18,18,20,20,20,20,20,20,20,20,20,20,20,21,21,21,21,21,21,21
%N A111653 n-th composite number appears n times.
%D A111653 T. M. Apostol, Introduction to Analytic Number Theory, Springer-Verlag, 
               1976, page 2.
%D A111653 J. B. Rosser and L. Schoenfeld, Approximate formulas for some functions 
               of prime numbers, Illinois J. Math. 6: 64-94 (1962).
%D A111653 L. Panaitopol, Some Properties of the Series of Composed Numbers, J. 
               Inequalities in Pure and Applied Mathematics. 2(2): Article 38, 2000.
%H A111653 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               CompositeNumber.html">Composite Number."</a>
%F A111653 A002808(n) appears n times.
%Y A111653 Cf. A002808, A111654, A111655.
%Y A111653 Sequence in context: A103411 A074672 A070259 this_sequence A049089 A028327 
               A006890
%Y A111653 Adjacent sequences: A111650 A111651 A111652 this_sequence A111654 A111655 
               A111656
%K A111653 easy,nonn
%O A111653 1,1
%A A111653 Jonathan Vos Post (jvospost3(AT)gmail.com), Aug 12 2005