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%I #10 Nov 20 2013 20:01:08
%S 3,2,1,2,3,4,3,2,1,2,3,4,5,6,7,8,9,8,7,6,5,4,3,2,3,4,5,6,5,4,3,4,5,6,
%T 7,8,9,8,7,8,9,8,7,6,5,4,3,2,3,4,5,6,7,8,7,6,5,4,5,6,5,4,3,2,3,4,5,6,
%U 5,4,3,3,4,5,6,7,8,7,6,5,4,3,2,3,4,5,6
%N A walk based on the digits of Pi (A000796).
%C Pi = 3.14159265358979323846....
%C Between 3 and 1 we place 2.
%C Between 1 and 4 we place 2 and 3.
%C Between 4 and 1 we place 3 and 2.
%C Between 1 and 5 we place 2, 3, and 4.
%C Between 5 and 9 we place 6, 7, and 8.
%C Between 9 and 2 we place 8, 7, 6, 5, 4 and 3.
%C Between 2 and 6 we place 3, 4 and 5.
%C Between 6 and 5 we place nothing.
%C Between 5 and 3 we place 4, and so on.
%C This gives:
%C 3, 2, 1, 2, 3, 4, 3, 2, 1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 7, 6, 5, 4, 3, 2, 3, 4, 5, 6, 5, 4, 3, 4, 5, ...
%C This could be called a walk (or promenade) on the digits of Pi.
%Y Cf. A000796
%K nonn,easy,base
%O 1,1
%A _Philippe Deléham_, Nov 20 2013
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