Primality proof for n = 4206583:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=233.html>233 is prime.</a>
<br>b^((n-1)/233)-1 mod n = 2192711, which is a unit, inverse 2712819.
<p><a href=59.html>59 is prime.</a>
<br>b^((n-1)/59)-1 mod n = 3747588, which is a unit, inverse 836166.
<p>(59 * 233) divides n-1.
<p>(59 * 233)^2 > n.
<p>n is prime by Pocklington's theorem.