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Numbers whose base-10 representation has the same nonzero number of 0's and 4's.
0

%I #9 Jun 30 2021 03:39:46

%S 40,104,140,204,240,304,340,401,402,403,405,406,407,408,409,410,420,

%T 430,450,460,470,480,490,504,540,604,640,704,740,804,840,904,940,1014,

%U 1024,1034,1041,1042,1043,1045,1046,1047,1048,1049,1054,1064,1074

%N Numbers whose base-10 representation has the same nonzero number of 0's and 4's.

%K nonn,base,easy

%O 1,1

%A _Olivier GĂ©rard_