Primality proof for n = 858001:
<p>Take b = 3.
<p>b^(n-1) mod n = 1.
<p><a href=13.html>13 is prime.</a>
<br>b^((n-1)/13)-1 mod n = 475196, which is a unit, inverse 814521.
<p><a href=11.html>11 is prime.</a>
<br>b^((n-1)/11)-1 mod n = 157914, which is a unit, inverse 339622.
<p><a href=5.html>5 is prime.</a>
<br>b^((n-1)/5)-1 mod n = 421969, which is a unit, inverse 847141.
<p>(5^3 * 11 * 13) divides n-1.
<p>(5^3 * 11 * 13)^2 > n.
<p>n is prime by Pocklington's theorem.