%I #6 Dec 12 2016 09:14:34
%S 0,1,2,3,4,5,6,7,70,71,8,72,9,17,10,11,73,12,13,74,14,15,27,16,18,19,
%T 37,20,21,22,23,75,24,25,26,28,76,29,30,31,32,47,33,34,35,36,38,57,39,
%U 40,41,42,43,44,78,45,46,48,49,50,51,79,52,53,54,55,56,58,67,59,60,61,62,63,64,65,87,66,68,69,80,81,82,83,84,700,85,86,88,89,90,91,92,97,93,94,95,96,98,99,100,101,701,102,103,104,105,106,107,108,109
%N Between two successive digits "7" there are 0, then 1, then 2, then 3, ... other digits.
%C The sequence starts with a(1) = 0 and is always extended with the smallest integer not yet present that does not lead to a contradiction.
%H Jean-Marc Falcoz, <a href="/A278942/b278942.txt">Table of n, a(n) for n = 1..1059</a>
%e There are 0 digit between "7" and "70"; there is 1 digit between the "7" of "70" and the "7" of "71" (this is the "0" of "70"); there are 2 digits between the "7" of "71" and the "7" of "72" (they are the "1" of "71" and the "8" of "8"); there are 3 digits between the "7" of "72" and the "7" of "17" (they are the "2" of "72", the "9" of "9" and the "1" of "17"); etc.
%K nonn,base
%O 1,3
%A _Eric Angelini_ and _Jean-Marc Falcoz_, Dec 02 2016