Primality proof for n = 76471:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=2549.html>2549 is prime.</a>
<br>b^((n-1)/2549)-1 mod n = 12512, which is a unit, inverse 23231.
<p>(2549) divides n-1.
<p>(2549)^2 > n.
<p>n is prime by Pocklington's theorem.