OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..600
MATHEMATICA
Select[Range[5000], Intersection[IntegerDigits[#, 4], IntegerDigits[#, 5]]=={}&] (* Vincenzo Librandi, Jun 07 2012 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved