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A308897 Walk a rook along the square spiral numbered 1, 2, 3, ... (cf. A274640); a(n) = mex of earlier values the rook can move to. 1

%I #10 Jul 02 2019 11:05:22

%S 1,2,1,2,3,4,1,3,4,2,3,4,1,3,4,2,5,6,7,8,1,5,6,7,8,2,5,6,7,8,1,5,6,7,

%T 8,2,3,6,5,8,7,4,1,3,6,5,8,7,4,2,3,6,5,8,7,4,1,3,6,5,8,7,4,2,9,10,11,

%U 12,13,14,15,16,1,9,10,11,12,13,14,15,16,2

%N Walk a rook along the square spiral numbered 1, 2, 3, ... (cf. A274640); a(n) = mex of earlier values the rook can move to.

%C Mex here means "smallest positive missing number".

%C Add 1 to the terms of A308896.

%Y Cf. A274640, A308896.

%K nonn

%O 1,2

%A _N. J. A. Sloane_, Jul 02 2019

%E More terms from _Rémy Sigrist_, Jul 02 2019

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Last modified May 21 13:13 EDT 2024. Contains 372736 sequences. (Running on oeis4.)