OFFSET
1,1
LINKS
Vincenzo Librandi, Table of n, a(n) for n = 1..9000
MATHEMATICA
Select[Range[10000], DigitCount[#, 4, 0] == 1 && DigitCount[#, 4, 1] == 2 &] (* Vincenzo Librandi, Sep 21 2016 *)
CROSSREFS
KEYWORD
nonn,base
AUTHOR
STATUS
approved