%I #12 Jan 31 2018 06:56:52
%S 1,3,4,2,5,7,8,6,9,11,13,30,21,15,17,19,31,33,35,37,39,51,34,23,36,25,
%T 50,20,27,38,29,70,22,24,41,52,26,43,40,56,53,45,65,28,42,55,60,44,57,
%U 46,59,48,73,62,71,75,61,58,77,47,49,64,74,78,63,67,81,72,79,90,91,92,68,95,69,93
%N Pick any digit "d" in the sequence; the sum ["d" + (the next d digits)] is always even.
%C The sequence starts with a(1) = 1 and was always extended with the smallest available integer not yet present in the sequence. This is the lexicographically first sequence with this property.
%H Lars Blomberg, <a href="/A297969/b297969.txt">Table of n, a(n) for n = 1..10000</a>
%e 1 + 3 (the next digit) = 4 (even);
%e 3 + 4,2,5 (the next 3 digits) = 14 (even);
%e 4 + 2,5,7,8 (the next 4 digits) = 26 (even);
%e 2 + 5,7 (the next 2 digits) = 14 (even);
%e ...
%e 9 + 1,1,1,3,3,0,2,1,1 = 22 (even);
%e ...
%e 0 + (no digit) = 0 (even).
%K base,nonn
%O 1,2
%A _Eric Angelini_ and _Lars Blomberg_, Jan 10 2018
