The eighth challenge of the 2021 Series will be a 3-day challenge in Thanksgiving™ of the anniversary of the introduction of e, or Euler's Number! The challenge will be offered on the AP27 Search subproject, beginning 23 November 05:00 UTC and ending 26 November 05:00 UTC.
To participate in the Challenge, please select only the AP 27 (AP27) project in your PrimeGrid preferences section.
For more info and discussion, check out the forum thread for this challenge: https://www.primegrid.com/forum_thread.php?id=9792&nowrap=true#152286
Best of luck!