OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..5000
MATHEMATICA
Select[Range[20000], DigitCount[#, 4, 0] == 4 &&DigitCount[#, 4, 1] == 1 &] (* Vincenzo Librandi, Sep 23 2016 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved