Primality proof for n = 3824551:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=2833.html>2833 is prime.</a>
<br>b^((n-1)/2833)-1 mod n = 2872208, which is a unit, inverse 2513082.
<p>(2833) divides n-1.
<p>(2833)^2 > n.
<p>n is prime by Pocklington's theorem.