Primality proof for n = 1276987:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=179.html>179 is prime.</a>
<br>b^((n-1)/179)-1 mod n = 449904, which is a unit, inverse 486054.
<p><a href=41.html>41 is prime.</a>
<br>b^((n-1)/41)-1 mod n = 1207307, which is a unit, inverse 543984.
<p>(41 * 179) divides n-1.
<p>(41 * 179)^2 > n.
<p>n is prime by Pocklington's theorem.