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%I #5 May 23 2016 00:51:50
%S 1,1,3,9,28,93,315,1091,3855,13797,49929,182361,671088,2485504,
%T 9256395,34636833,130150493,490853403,1857283155,7048151355,
%U 26817356775,102280151421,390937467284,1497207322929,5744387279808,22076468760335
%N Number of cycles of length n under the mapping x -> x^2-2 modulo Fermat prime 2^(2^m)+1, where m is any fixed integer such that n divides 2^m-1.
%C Halved bisection of A001037.
%F a(n) = A001037(2n+1)/2.
%Y Cf. A001037, A059966.
%K nonn
%O 0,3
%A _Max Alekseyev_, Sep 27 2007
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