450312domain: NAppears in sequencesNonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+647)^2 = y^2.at n=12A130013Number of (n+1)X(3+1) 0..1 arrays with each row and column prime, read as a binary number with top and left being the most significant bits.at n=12A261756