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..1061
EXAMPLE
There are 0 digit between "9" and "90"; there is 1 digit between the "9" of "90" and the "9" of "91" (this is the "0" of "90"); there are 2 digits between the "9" of "91" and the "9" of "19" (they are the "1" of "91" and the "1" of "19"); there are 3 digits between the "9" of "19" and the "9" of "29" (they are the "1" of "10", the "0" of "10" and the "2" of "29"); etc.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Eric Angelini and Jean-Marc Falcoz, Dec 02 2016
STATUS
approved