OFFSET
1,2
COMMENTS
The sequence is started with a(1) = 1 and always extended with the smallest integer not yet present and not leading to a contradiction.
LINKS
Jean-Marc Falcoz, Table of n, a(n) for n = 1..3002
EXAMPLE
The first 15 terms are:
1,11,2,10,20,3,4,100,5,6,7,200,8,9,13
Their successive digits are:
1,1,1,2,1,0,2,0,3,4,1,0,0,5,6,7,2,0,0,8,9,1,3
The prime rank digits are here (between parentheses):
1,(1)(1),2,(1)0,(2)0,3,4,(1)0(0),5,6,7,(2)0(0),8,9,1(3),...
Erasing the digits not in the parentheses:
.,(1)(1),.,(1).,(2).,.,.,(1).(0),.,.,.,(2).(0),.,.,.(3),...
The surviving digits are:
1,1,1,2,1,0,2,0,3,...
Those are indeed the digits of the starting sequence.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Eric Angelini and Jean-Marc Falcoz, Mar 23 2017
STATUS
approved