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Clog sequence in base 4. Right to left concatenation of n, int(log_4(n)), int(log_4(int(log_4(n)))), ... in base 4.
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%I #4 Mar 30 2012 17:20:44

%S 1,2,3,20,21,22,23,24,25,26,27,28,29,30,31,144,145,146,147,148,149,

%T 150,151,152,153,154,155,156,157,158,159,160,161,162,163,164,165,166,

%U 167,168,169,170,171,172,173,174,175,176,177,178,179,180,181,182,183

%N Clog sequence in base 4. Right to left concatenation of n, int(log_4(n)), int(log_4(int(log_4(n)))), ... in base 4.

%K nonn,base,easy

%O 1,2

%A _Olivier GĂ©rard_