OFFSET
1,3
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..4000
MATHEMATICA
Select[Range[0, 171], LessEqual@@IntegerDigits[#, 7]&] (* Ray Chandler, Jan 06 2014 *)
CROSSREFS
KEYWORD
nonn,base,easy
AUTHOR
STATUS
approved