Search: id:A089909
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%I A089909
%S A089909 0,36,748,11460,154572,1945684,23456796,274567908,3145679020,
%T A089909 35456790132,394567901244,4345679012356,47456790123468,514567901234580,
%U A089909 5545679012345692,59456790123456804,634567901234567916
%N A089909 Sum of digits of numbers between 0 and (8/9)*(10^n-1).
%C A089909 From a suggestion of Yalcin Aktar (aktaryalcin(AT)msn.com)
%F A089909 a(n)=s(8, 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 A089909 Cf. A089903, A089904, A089905, A087330, A089906, A089907, A089908, A034967.
%Y A089909 Sequence in context: A064541 A058001 A004329 this_sequence A049434 A144941 
               A036084
%Y A089909 Adjacent sequences: A089906 A089907 A089908 this_sequence A089910 A089911 
               A089912
%K A089909 nonn,base
%O A089909 0,2
%A A089909 Benoit Cloitre (benoit7848c(AT)orange.fr), Nov 14 2003

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