Primality proof for n = 861659:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=61547.html>61547 is prime.</a>
<br>b^((n-1)/61547)-1 mod n = 16383, which is a unit, inverse 450684.
<p>(61547) divides n-1.
<p>(61547)^2 > n.
<p>n is prime by Pocklington's theorem.