Primality proof for n = 923685781:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=15661.html>15661 is prime.</a>
<br>b^((n-1)/15661)-1 mod n = 93724087, which is a unit, inverse 64698943.
<p><a href=983.html>983 is prime.</a>
<br>b^((n-1)/983)-1 mod n = 809110538, which is a unit, inverse 338788071.
<p>(983 * 15661) divides n-1.
<p>(983 * 15661)^2 > n.
<p>n is prime by Pocklington's theorem.