OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..1000
MATHEMATICA
Select[Range[1100], DigitCount[#, 7, 6]-DigitCount[#, 7, 0]==2&] (* Harvey P. Dale, May 16 2012 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
EXTENSIONS
Definition clarified by Harvey P. Dale, May 16 2012
STATUS
approved