Search: id:A054464
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%I A054464
%S A054464 4,34,90,175,800,2999,3624,30624,60000,390624,499999,4000000,8890624,
%T A054464 17109375,69999999,200000000,2787109375,8999999999
%N A054464 Numbers n such that sum(k=1,n,d(k)) is an integer where d(k) is the decimal 
               fraction 0.k (e.g. d(999)=0.999).
%C A054464 Further terms become very sparse, with no more through 36000000000. - 
               Ryan Propper (rpropper(AT)stanford.edu), Aug 25 2005
%e A054464 0.1+0.2+0.3+0.4=1 hence 4 is in the sequence.
%t A054464 Flatten[Position[IntegerQ /@ Table[ Sum[10^-Length[IntegerDigits[i]]*i, 
               {i, j}], {j, 1, 50000}], True]] (from Vit Planocka)
%Y A054464 Sequence in context: A102959 A057959 A053902 this_sequence A002101 A129557 
               A085695
%Y A054464 Adjacent sequences: A054461 A054462 A054463 this_sequence A054465 A054466 
               A054467
%K A054464 base,nonn
%O A054464 1,1
%A A054464 Benoit Cloitre (benoit7848c(AT)orange.fr), Aug 30 2003
%E A054464 One more term from Vit Planocka (planocka(AT)mistral.cz), Sep 24 2003
%E A054464 Terms a(9) - a(15) from John W. Layman (layman(AT)math.vt.edu), Jun 03 
               2005
%E A054464 a(16) - a(18) from Ryan Propper (rpropper(AT)stanford.edu), Aug 25 2005

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