1030190domain: NAppears in sequencesMinimal positive solution a(n) of Pell equation a(n)^2 - D(n)*b(n)^2 = +4 or -4 with D(n)=A077425(n). The companion sequence is b(n)=A077058(n).at n=43A078361a(n) = 1225*n^2 - 35.at n=28A158735