The third challenge of the 2023 Series will be a 7-day challenge celebrating the 200th birthday of German number theorist Ferdinand Gotthold Max Eisenstein. The challenge will be offered on the PSP-LLR application, beginning 16 April 16:00 UTC and ending 23 April 16:00 UTC. To participate in the Challenge, please select only the Prime Sierpinski Problem (LLR) project in your PrimeGrid preferences section. Comments? Concerns? Complaints? Critiques? Contemplations? Join the discussion at https://www.primegrid.com/forum_thread.php?id=10202

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