This number is the value of the Riemann zeta funct
This number is the value of the Riemann zeta function which yields ApÃ©ry's constant and Waring's problem asks whether every positive integer can be written as the sum of nine or fewer numbers raised to this power. Stewart's theorem relates the side lengths of a polygon with this number of sides to its cevian. It is the only prime triangular number and the only prime one less than a perfect square. This number is the minimum number of points needed to define a circle and the sum of interior angles of a polygon with this number of sides is 180 degrees.  For 10 points, name this integer, the first odd prime number. 
This number is the value of the Riemann zeta function which yields ApÃ©ry's constant and Waring's problem asks whether every positive integer can be written as the sum of nine or fewer numbers raised to this power.
three [accept third] 