OFFSET
1,1
LINKS
Harvey P. Dale, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Range[300], Intersection[Union[IntegerDigits[#, 6]], Union[IntegerDigits[#, 7]]]=={}&] (* Harvey P. Dale, Oct 19 2011 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved