OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..2000
MATHEMATICA
Select[Range[10000], DigitCount[#, 4, 0] == 3 && DigitCount[#, 4, 1] == 4 &] (* Vincenzo Librandi, Sep 23 2016 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved