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%I #17 May 11 2017 11:47:23
%S 1,7,143,7429,94395,70514711,68421139647,3628781953225,
%T 180465781280744001,1051696554978819009,2043771643161196817,
%U 455757414124192757820663,145129235359794615466069,1358004768744860147421669766123,9043798410819212324167588503127725
%N Denominator of A285388(n+1)/A285388(n).
%e a(2)=(7); a(3)=(11*13); a(4)=(17*19*23); a(5)=3*5*7*(29*31); ...
%Y Cf. A285388.
%K nonn
%O 1,2
%A _Ralf Steiner_, May 10 2017