OFFSET
1,2
COMMENTS
For 99 < n < 1000, n belongs to the list if (floor(n/100) mod 10) belongs to the list (i.e., is either 1 or 8).
For 10^(2k+1)-1 < n < 10^(2k+3), where k is a positive integer, n belongs to the list if (floor(n/(10^(2k+1))) mod 100) belongs to the list.
LINKS
CROSSREFS
KEYWORD
easy,nonn,word
AUTHOR
Sangeet Paul, May 30 2019
STATUS
approved