Primality proof for n = 6254681:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=577.html>577 is prime.</a>
<br>b^((n-1)/577)-1 mod n = 1181281, which is a unit, inverse 2522536.
<p><a href=271.html>271 is prime.</a>
<br>b^((n-1)/271)-1 mod n = 280377, which is a unit, inverse 5133520.
<p>(271 * 577) divides n-1.
<p>(271 * 577)^2 > n.
<p>n is prime by Pocklington's theorem.