OFFSET
1,1
COMMENTS
The sequence starts with a(1) = 8 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
8 shows a digit 8, of course (k = 1)
8 + 10 = 18 and 18 shows at least a digit 8 (k = 2)
8 + 10 + 20 = 38 and 38 shows at least a digit 8 (k = 3)
8 + 10 + 20 + 30 = 68 and 68 shows at least a digit 8 (k = 4)
8 + 10 + 20 + 30 + 12 = 80 and 80 shows at least a digit 8 (k = 5)
8 + 10 + 20 + 30 + 12 + 1 = 81 and 81 shows at least a digit 8 (k = 6)
...
CROSSREFS
KEYWORD
nonn,base
AUTHOR
Eric Angelini and Jean-Marc Falcoz, Feb 23 2018
STATUS
approved