Primality proof for n = 7949:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=1987.html>1987 is prime.</a>
<br>b^((n-1)/1987)-1 mod n = 15, which is a unit, inverse 530.
<p>(1987) divides n-1.
<p>(1987)^2 > n.
<p>n is prime by Pocklington's theorem.