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PrimeGrid's 2026 Challenge Series: 1 16-23 January 20:00:00 ESP World Nothing Day Challenge 7 days 2 7-17 March 10:00:00 SoB Telephone Challenge 10 days 3 3-10 June 21:00:00 321 h4ck3r's Birthday Challenge 7 days 4 16-21 July 16:00:00 Primorial World Snake Day Challenge 5 days 5 12-15...

🎶 In the year 2025 If man is still alive If woman can survive They may find...a prime number? 🎶 PrimeGrid's 2025 Challenge Series: Date Time UTC Project(s) Challenge Duration 1 20-23 January 07:00:00 PPSE Penguin Awareness Day Challenge 3 days 2 24-29 March 01:00:00 GFN-18 (GPU)...

This came from PrimeGrid's news just now, but it affects all projects:

Current race: GFN-21 (and only 21!), December 11-21 (22:23 UTC) Now that Christmas is over, it's time to think about the new year...of PrimeGrid races! Here's the (tentative) list of all races for this year (thanks to @StefanR5R): Date Time UTC Project Challenge...

Table of contents: #1 .......... GCW Sieve v1.00 #2 .......... SoB-LLR v7.06 #6 .......... PSP-LLR v8.00 #9 .......... SGS-LLR v8.00 #31 ........ GCW-LLR v8.00 #39 ........ 321-LLR v8.00 #45 ........ ESP-LLR v8.00 #53 ........ SR5-LLR v8.01 #56 ........ PPS-LLR v8.01 #70 ........ GFN21 v3.20...

Current race: PPS Sieve, December 18-21 (16:28 UTC) Welcome to another year of PrimeGrid races! Here's the (tentative) list of all races for this year: What you need: One or more fast x86 processors. (Even slow ones might do!) Windows (Vista or later 64-bit, or XP or later 32-bit), Linux, or...