9

This number is a composite.

Just showing those entries submitted by 'Blachs': (Click here to show all)

There are only 9 Heegner Numbers: h= 1, 2, 3, 7, 11, 19, 43, 67, 163. To each of these, we can see that if p = (h+1)/4 is prime, then x^2 + x + (h+1)/4 will be a prime-generating polynomial. [Blachs]