Primality proof for n = 4283:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=2141.html>2141 is prime.</a>
<br>b^((n-1)/2141)-1 mod n = 3, which is a unit, inverse 1428.
<p>(2141) divides n-1.
<p>(2141)^2 > n.
<p>n is prime by Pocklington's theorem.