Primality proof for n = 6277:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=523.html>523 is prime.</a>
<br>b^((n-1)/523)-1 mod n = 4095, which is a unit, inverse 210.
<p>(523) divides n-1.
<p>(523)^2 > n.
<p>n is prime by Pocklington's theorem.