Primality proof for n = 9211861:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=2437.html>2437 is prime.</a>
<br>b^((n-1)/2437)-1 mod n = 7725236, which is a unit, inverse 5788243.
<p><a href=7.html>7 is prime.</a>
<br>b^((n-1)/7)-1 mod n = 7075515, which is a unit, inverse 3946268.
<p>(7 * 2437) divides n-1.
<p>(7 * 2437)^2 > n.
<p>n is prime by Pocklington's theorem.