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%I #2 Mar 30 2012 17:22:47
%S 3,15,7,341,819,9709,2047,475107,31,3233097,5461,8388607,3556769739,
%T 31675383749,65498251203,575525617597,34359738367,549755813887,
%U 182518930210733,2047,37905296863701641,2251799813685247
%N Length of all the nontrivial cycles of the Ducci map for n in A138004.
%C It appears that the maximum possible cycle length is n*(2^((n-1)/2)-1).
%Y Cf. A135546.
%K nonn
%O 1,1
%A _T. D. Noe_, Feb 26 2008
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