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%I #17 Jan 14 2019 04:39:53
%S 0,2,1,4,3,6,5,8,7,80,20,21,22,12,14,16,18,24,26,28,34,36,38,40,41,42,
%T 43,44,46,48,56,58,60,61,62,63,64,65,66,68,78,81,82,83,84,85,86,87,88,
%U 120,200,202,121,204,122,124,126,128,140,206,141,208,142,143,400,212,144,146,148,160,214,161,216,162,163,402,164,165,600
%N The larger digit of any pair of adjacent digits is always even.
%C The sequence is started with a(1) = 0 and always extended with the smallest integer not yet present and not leading to a contradiction.
%H Jean-Marc Falcoz, <a href="/A282651/b282651.txt">Table of n, a(n) for n = 1..10001</a>
%e In the 1st pair of digits (0,2) the larger digit is (2), which is even;
%e in the 2nd pair of digits (2,1) the larger digit is (2), which is even;
%e in the 3rd pair of digits (1,4) the larger digit is (4), which is even;
%e in the 4th pair of digits (4,3) the larger digit is (4), which is even;
%e ...
%e in the 9th pair of digits (7,8) the larger digit is (8), which is even;
%e in the 10th pair of digits (8,0) the larger digit is (8), which is even;
%e in the 11th pair of digits (0,2) the larger digit is (2), which is even; etc.
%Y Cf. A282650 (... is always odd).
%K nonn,base
%O 1,2
%A _Eric Angelini_ and _Jean-Marc Falcoz_, Feb 20 2017
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