OFFSET
1,2
COMMENTS
The sequence starts with a(1) = 1 and is always extended with the smallest integer not used so far that doesn't lead to a contradiction. It is conjectured that this sequence is a permutation of the integers > 0.
LINKS
Lars Blomberg, Table of n, a(n) for n = 1..1000
EXAMPLE
The sequence starts with:
1,2,20,200,3,210,10,4,30,21,100,5,110,6,40,300,7,22,11,120
If 1 out of 2 digit is erased, we get:
1,.,2.,2.0,.,2.0,.0,.,3.,2.,1.0,.,1.0,.,4.,3.0,.,2.,1.,1.0
This succession of digits is the same as the starting sequence.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Eric Angelini and Lars Blomberg, Apr 24 2018
STATUS
approved