Find the greatest prime divisor of the value of the arithmetic series 1 + 2 + 3 + \dots + 200
1 + 2 + 3 + ....+ 200 = [ 1 + 200] * 100 =
20100 =
201 * 100 =
67 * 3 * 5^2 * 2^2
67 is the greatest prime divisor
+1839 
