Primality proof for n = 995987:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=497993.html>497993 is prime.</a>
<br>b^((n-1)/497993)-1 mod n = 3, which is a unit, inverse 331996.
<p>(497993) divides n-1.
<p>(497993)^2 > n.
<p>n is prime by Pocklington's theorem.