OFFSET
1,1
COMMENTS
If n is a term then 10*n is also a term, and conversely.
Every number of the form 10^d - 1 with d > 1 is a term.
LINKS
David Radcliffe, Table of n, a(n) for n = 1..1263
EXAMPLE
99 is a term because each term of the arithmetic sequence {99, 198, 297, 396, ...} has a nonzero digit in common with the next.
CROSSREFS
KEYWORD
nonn,base
AUTHOR
David Radcliffe and Daniel Griller, May 28 2019
STATUS
approved