9752810755domain: NAppears in sequencesThe values of 'a' in a^2 + b^2 = c^2, where b - a = 17 and gcd(a, b, c) = 1.at n=23A117473a(n) = 7*a(n-1) - 7*a(n-2) + a(n-3) for n > 2; a(0) = 28, a(1) = 207, a(2) = 1248.at n=11A155466