%I #13 Aug 22 2021 16:14:31
%S 4,16,33,36,49,52,64,97,100,113,116,129,132,144,161,164,177,180,193,
%T 196,208,225,228,241,244,256,353,356,369,372,385,388,400,417,420,433,
%U 436,449,452,464,481,484,497,500,513,516,528,545
%N Numbers k such that 0 and 1 occur juxtaposed in the base-4 representation of k but not of k-1.
%Y Cf. A007090.
%K nonn,base
%O 1,1
%A _Clark Kimberling_