A340504 - OEIS

%I #7 Jan 17 2021 16:45:16

%S 0,3,0,1,0,3,2,3,0,3,0,1,2,1,0,1,0,3,0,1,0,3,2,3,2,1,2,3,0,3,2,3,0,3,

%T 0,1,0,3,2,3,0,3,0,1,2,1,0,1,2,1,2,3,2,1,0,1,0,3,0,1,2,1,0,1,0,3,0,1,

%U 0,3,2,3,0,3,0,1,2,1,0,1,0,3,0,1,0,3,2,3,2,1,2,3,0,3,2,3,2,1,2,3,2,1,0,1,2

%N Fixed under 0 -> 03, 1 -> 23, 2 -> 21, 3 -> 01.

%C Yet another version of the Rudin-Shapiro sequence A020987.

%D Dekking, Michel, Michel Mendes France, and Alf van der Poorten. "Folds." The Mathematical Intelligencer, 4.3 (1982): 130-138 & front cover, and 4:4 (1982): 173-181 (printed in two parts). See Observation 1.17.

%Y Cf. A020985, A020987, A100260, A340503.

%K nonn

%O 1,2

%A _N. J. A. Sloane_, Jan 17 2021