Primality proof for n = 6917:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=19.html>19 is prime.</a>
<br>b^((n-1)/19)-1 mod n = 4063, which is a unit, inverse 3633.
<p><a href=13.html>13 is prime.</a>
<br>b^((n-1)/13)-1 mod n = 1746, which is a unit, inverse 5162.
<p>(13 * 19) divides n-1.
<p>(13 * 19)^2 > n.
<p>n is prime by Pocklington's theorem.