OFFSET
1,1
COMMENTS
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1400
FORMULA
a(n) = 9*A043312(n) (= 9*n for n<8). - M. F. Hasler, Feb 02 2014
MATHEMATICA
Select[Range[10000], Union[Length/@Split[IntegerDigits[#, 8]]]=={2}&] (* Vincenzo Librandi, Feb 05 2014 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
Typo in name corrected by Vincenzo Librandi, Feb 05 2014
STATUS
approved