Primality proof for n = 11636921:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=290923.html>290923 is prime.</a>
<br>b^((n-1)/290923)-1 mod n = 8784011, which is a unit, inverse 7724096.
<p>(290923) divides n-1.
<p>(290923)^2 > n.
<p>n is prime by Pocklington's theorem.