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==Prime Sierpiński problem== {{unsolved|mathematics|Is 271,129 the smallest prime Sierpiński number?}} In 1976, Nathan Mendelsohn determined that the second provable Sierpiński number is the prime ''k'' = 271129. The '''prime Sierpiński problem''' asks for the value of the smallest ''prime'' Sierpiński number, and there is an ongoing "Prime Sierpiński search" which tries to prove that 271129 is the first Sierpiński number which is also a prime.<ref>{{Cite web|url=https://www.primegrid.com/forum_thread.php?id=972|title=About the Prime Sierpinski Problem|last=Goetz|first=Michael|date=July 10, 2008|website=PrimeGrid|access-date=September 12, 2019}}</ref>
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