I saw this one SR5 task of mine that took almost 12,000 seconds when they usually run 6-9k seconds... The long task is http://www.primegrid.com/result.php?resultid=483864728 and an example of one of the shorter ones is http://www.primegrid.com/result.php?resultid=483804467
Why is this? They were both completed today, and the long one validated just fine, not prime. Since it was taking ~2x as long as normal, I thought it might have been a serpinski prime, since in http://www.primegrid.com/forum_thread.php?id=5203 mike says this:
Sierpinski (+1) primes "only" take twice as long. Just seems weird that it took twice as long and was not prime. Could have it thought it was a prime and on the second pass that took longer it found it was not prime?
275*2^3585539+1 is prime!!! (1079358 digits)
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