Primality proof for n = 617:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=11.html>11 is prime.</a>
<br>b^((n-1)/11)-1 mod n = 417, which is a unit, inverse 472.
<p><a href=7.html>7 is prime.</a>
<br>b^((n-1)/7)-1 mod n = 419, which is a unit, inverse 483.
<p>(7 * 11) divides n-1.
<p>(7 * 11)^2 > n.
<p>n is prime by Pocklington's theorem.