OFFSET
1,2
COMMENTS
After a(1) = 0, the sequence is always extended with the smallest integer not yet present which does not lead to a contradiction.
In a private mail to Eric Angelini, Lars Blomberg wrote about the b-file: "Only the even terms 0, 2, 4, 10, 1110, 12, 110, 6, 8, 2110, 2112, 2114, 14, 16, 18, 1112, 112, 2116 [are in this b-file]; so the sequence will continue from 2116 on with 2116 odd numbers, then an even one, etc."
LINKS
Lars Blomberg, Table of n, a(n) for n = 1..8887
EXAMPLE
There are respectively 0 odd terms after "0", then 2 odd terms after "2" (they are 1 and 3), then 4 odd terms after "4" (they are 5, 7, 9 and 121), then 10 odd terms after "10" (they are 221, 123, 125, 127, 129, 141, 11, 143, 13 and 145), etc.
But there are also respectively 0 odd digits after "0", then 2 odd digits after "2" (they are 1 and 3), then 4 odd digits after "4" (they are 4, 5, 7, 9 and 1), then 2 odd digits after the "2" of "121" (they are the last "1" of "121" and the starting "1" of "10"), then 0 odd digits after "0", then 2 odd digits after the "2" of "21" (they are the "1" of "21" and the starting "1" of 123), etc.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Eric Angelini and Lars Blomberg Oct 26 2016
STATUS
approved