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%I #5 Mar 30 2012 18:56:41
%S 9,25,36,41,57,73,89,100,105,121,137,144,164,169,185,201,217,228,233,
%T 249,265,281,292,297,313,329,345,356,361,377,393,400,420,425,441,457,
%U 473,484,489,505,521,537,548,553,569,576,649
%N Numbers n such that string 2,1 occurs in the base 4 representation of n but not of n-1.
%K nonn,base
%O 1,1
%A _Clark Kimberling_
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