OFFSET
1,1
COMMENTS
The sequence starts with a(1) = 6 and is always extended with the smallest integer not yet present that does not lead to a contradiction.
A permutation of the natural numbers.
LINKS
Jean-Marc Falcoz, Table of n, a(n) for n = 1..10001
EXAMPLE
6 shows a digit 6, of course (k = 1)
6 + 10 = 16 and 16 shows at least a digit 6 (k = 2)
6 + 10 + 20 = 36 and 36 shows at least a digit 6 (k = 3)
6 + 10 + 20 + 24 = 60 and 60 shows at least a digit 6 (k = 4)
6 + 10 + 20 + 24 + 1 = 61 and 61 shows at least a digit 6 (k = 5)
6 + 10 + 20 + 24 + 1 + 2 = 63 and 63 shows at least a digit 6 (k = 6)
...
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Eric Angelini and Jean-Marc Falcoz, Feb 23 2018
STATUS
approved