97513domain: NAppears in sequencesa(n) = 6*a(n-1) - a(n-2) - 2 with a(0) = 1, a(1) = 3.at n=7A011900a(2n) = A011900(n), a(2n+1) = A001109(n+1).at n=14A113225Positive numbers y such that y^2 is of the form x^2+(x+577)^2 with integer x.at n=10A159626Numbers k such that k!/m! is a triangular number for some m < k-1.at n=13A227026