Primality proof for n = 6487537818497:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=7240555601.html>7240555601 is prime.</a>
<br>b^((n-1)/7240555601)-1 mod n = 82534153614, which is a unit, inverse 5074107516104.
<p>(7240555601) divides n-1.
<p>(7240555601)^2 > n.
<p>n is prime by Pocklington's theorem.