OFFSET
1,1
COMMENTS
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1500
FORMULA
a(n) = 8*A043311(n) (= 8*n for n<7). - M. F. Hasler, Feb 02 2014
MATHEMATICA
Select[Range[2500], Union[Length/@Split[IntegerDigits[#, 7]]]=={2}&] (* Harvey P. Dale, Oct 24 2011 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved