%I #6 Jul 24 2017 20:08:44
%S 12,24,36,48,60,72,84,96,108,120,132,134,135,136,137,138,139,140,141,
%T 142,264,265,267,268,269,270,271,272,273,274,396,397,398,400,401,402,
%U 403,404,405,406,528,529,530,531,533,534,535
%N Base 11 run lengths alternate: even, odd, even,...
%t rla11Q[n_]:=Module[{a=Boole[EvenQ/@(Length/@Split[IntegerDigits[n,11]])]}, a == PadRight[{},Length[a],{1,0}]]; Select[Range[600],rla11Q] (* _Harvey P. Dale_, Jul 24 2017 *)
%K nonn,base
%O 1,1
%A _Clark Kimberling_