A039550 - OEIS

%I #12 Jul 01 2021 02:12:13

%S 93,115,237,259,381,403,525,547,669,691,813,835,957,979,1017,1029,

%T 1041,1053,1065,1077,1089,1113,1116,1117,1118,1119,1120,1121,1122,

%U 1124,1126,1127,1137,1149,1245,1267,1303,1315,1327,1339,1351,1363

%N Numbers whose base-12 representation has the same nonzero number of 7's and 9's.

%t Select[Range[1500],DigitCount[#,12,7]==DigitCount[#,12,9]>0&] (* _Harvey P. Dale_, Oct 18 2016 *)

%K nonn,base,easy

%O 1,1

%A _Olivier Gérard_