OFFSET
1,3
COMMENTS
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.
LINKS
Jean-Marc Falcoz, Table of n, a(n) for n = 1..1054
EXAMPLE
There are 0 digit between "2" and "20"; there is 1 digit between the “2” of "20" and the "2" of "21" (this is the "0" of "20"); there are 2 digits between the "2" of "21" and the "2" of "23" (they are the "1" of "21" and the "3" of "3"); there are 3 digits between the "2" of "23" and the "2" of "24" (they are the "3" of "23", the "4" of "4" and the "5" of "5"); etc.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Eric Angelini and Jean-Marc Falcoz, Dec 02 2016
STATUS
approved