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A044451 Numbers n such that string 2,1 occurs in the base 4 representation of n but not of n+1. 0

%I

%S 9,25,39,41,57,73,89,103,105,121,137,159,167,169,185,201,217,231,233,

%T 249,265,281,295,297,313,329,345,359,361,377,393,415,423,425,441,457,

%U 473,487,489,505,521,537,551,553,569,639,649

%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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Last modified January 22 19:45 EST 2022. Contains 350504 sequences. (Running on oeis4.)