Search: id:A089903
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%I A089903
%S A089903 0,1,48,960,14572,195684,2456796,29567908,345679020,3956790132,
%T A089903 44567901244,495679012356,5456790123468,59567901234580,645679012345692,
%U A089903 6956790123456804,74567901234567916,795679012345679028
%N A089903 Sum of digits of numbers between 0 and (1/9)*(10^n-1).
%C A089903 From a suggestion of Yalcin Aktar (aktaryalcin(AT)msn.com)
%F A089903 a(n)=s(1, n-1) where s(a, k)=a*(k+1)+a^2*sum(i=0, k, i*10^(k-i))+sum(i=0, 
               k, 5*a*(9*(k-i)+a- 1)*10^(k-i-1))
%Y A089903 Cf. A089904, A089905, A089906, A087330, A089907, A089908, A089909, A034967.
%Y A089903 Sequence in context: A105948 A014401 A014703 this_sequence A160068 A010839 
               A000156
%Y A089903 Adjacent sequences: A089900 A089901 A089902 this_sequence A089904 A089905 
               A089906
%K A089903 nonn,base
%O A089903 0,3
%A A089903 Benoit Cloitre (benoit7848c(AT)orange.fr), Nov 14 2003

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