Search: id:A155817
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%I A155817
%S A155817 1,10,2,4,100,101,11,12,13,14,30,1000,10000,40,41,100000,102,43,60,110,
%T A155817 1000000,1001,61,80,111,100000000000,90,10000000,103,104,10001,1110,112,
%U A155817 201,108,91,95,160,161,100000000000000000000000000000000000,170,1000001
%N A155817 Sequence having the property that a(n) is the sum of the first a(n) digits 
               of the sequence
%C A155817 From an idea of Eric Angelini (eric.angelini(AT)kntv.be). The condition 
               of strict monotonicity is dropped with respect to A154328.
%H A155817 Jon Schoenfield, <a href="b155817.txt">Table of n, a(n) for n = 1..1000</
               a>
%e A155817 We start with a(1)=1. The next term a(2) cannot be 2,...,9 because the 
               sum of these digits would be larger: the least possibility not leading 
               to a contradiction is a(2)=10. Then we can go on with a(3)=2 because 
               the sum of the first two digits, 1=a(1) and 1 from 10=a(2), is equal 
               to 2. Then a(4)=4 because sum of the first 4 digits, 1+1+0+2, is 
               equal to 4.
%Y A155817 Cf. A154328
%Y A155817 Sequence in context: A049296 A161995 A069036 this_sequence A037922 A111287 
               A084455
%Y A155817 Adjacent sequences: A155814 A155815 A155816 this_sequence A155818 A155819 
               A155820
%K A155817 nonn
%O A155817 1,2
%A A155817 Paolo P. Lava (ppl(AT)spl.at), Jan 28 2009
%E A155817 Sequence corrected and extended by N. J. A. Sloane, Aug 31 2009, using 
               terms from the b-file.

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