A039557 - OEIS

%I #12 Jul 01 2021 02:13:30

%S 119,141,263,285,407,429,551,573,695,717,839,861,983,1005,1127,1149,

%T 1271,1293,1307,1319,1331,1343,1355,1367,1379,1391,1403,1427,1428,

%U 1429,1430,1431,1432,1433,1434,1435,1436,1438,1559,1581,1593,1605

%N Numbers whose base-12 representation has the same nonzero number of 9's and 11's.

%t Select[Range[2000],DigitCount[#,12,9]==DigitCount[#,12,11]>0&] (* _Harvey P. Dale_, Jan 30 2015 *)

%K nonn,base,easy

%O 1,1

%A _Olivier Gérard_