9

This number is a composite.

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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]

Submitted: 2026-02-13 12:55:56; Last Modified: 2026-02-13 13:00:43.