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Write down numbers from 0 to 19 around a circle. Start at 1, jump 7; repeat; when you land on a number it is removed.
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%I #3 Mar 30 2012 16:50:48

%S 1,8,15,3,11,19,9,18,10,2,14,7,5,4,6,13,0,12,16,17

%N Write down numbers from 0 to 19 around a circle. Start at 1, jump 7; repeat; when you land on a number it is removed.

%D Clifford A. Pickover, A Passion for Mathematics, Wiley, 2005; see p. 63, 301.

%K nonn,fini,full

%O 0,2

%A _N. J. A. Sloane_, Apr 21 2008