Primality proof for n = 276602624281642239937218680557139826668747:
<p>Take b = 2.
<p>b^(n-1) mod n = 1.
<p><a href=19757330305831588566944191468367130476339.html>19757330305831588566944191468367130476339 is prime.</a>
<br>b^((n-1)/19757330305831588566944191468367130476339)-1 mod n = 16383, which is a unit, inverse 94074944912245044309966580483695483989395.
<p>(19757330305831588566944191468367130476339) divides n-1.
<p>(19757330305831588566944191468367130476339)^2 > n.
<p>n is prime by Pocklington's theorem.