Search: id:A111936
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%I A111936
%S A111936 1,2,6,12,60,20,140,280,280,3080,9240,120120,120120,40040,80080,1361360,
%T A111936 12252240,2450448,2450448,2450448,56360304,56360304,1409007600,
%U A111936 1409007600,4227022800,4227022800,4227022800,131037706800,262075413600
%N A111936 Denominator of n-th term of the harmonic series after having removed 
               all terms containing in decimal representation a 9.
%C A111936 Numerator = A111935;
%C A111936 A111935(n)/a(n) ---> C with C<80.
%D A111936 G. Polya and G. Szego, Problems and Theorems in Analysis I (Springer 
               1924, reprinted 1972), Part One, Chap. 3, sect. 4, Problem 124.
%e A111936 n=9: 1/1+1/2+1/3+1/4+1/5+1/6+1/7+1/8+1/10 = 789/280, therefore a(9) = 
               280.
%Y A111936 Cf. A002805, A007095.
%Y A111936 Sequence in context: A152873 A083001 A119862 this_sequence A002805 A117481 
               A083268
%Y A111936 Adjacent sequences: A111933 A111934 A111935 this_sequence A111937 A111938 
               A111939
%K A111936 nonn,base,frac
%O A111936 1,2
%A A111936 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Aug 22 2005

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