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%I #10 Nov 01 2014 20:47:41
%S 1,3,29,29,5533,459233379,1744172093,52247563671651,883355242012099,
%T 375232122597949,2371488550627875869,82575946109948991589368825757,
%U 3036351832165747475453064886532125,545386932955383952248507479703588835,11628995674391064154406189307992618454723
%N Value of b in A216515.
%F A249514(n)^2 + 7*a(n)^2 = 2^A216515(n)-1.
%Y Cf. A216515, A249514.
%K nonn
%O 1,2
%A _Zak Seidov_, Oct 31 2014