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%I #9 Jun 15 2014 16:40:38
%S 1,2,7,12,17,36,41,83,275,284,307,443,444,775,869,2523,3485,4069,5772,
%T 9689,16403,30902,53359,83792,122933,1090845,1473689,1510781,1740110,
%U 2652867,2693291,3008386,3085790,51051449,55594816
%N From George Gilbert's marks problem: jumping 3 marks at a time (initial positions).
%D G. T. Gilbert, M. I. Krusemeyer and L. C Larson, The Wohascum Problem Book, Math. Assoc of America, 1993, Problem 103, p. 25; Solution, pp. 163-164.
%D Computed by _Marc Paulhus_
%Y Cf. A019593.
%K nonn
%O 0,2
%A _R. K. Guy_
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