About SRBase
is a mathematical research project that uses Internet-connected computers trying to solve Sierpinski / Riesel Bases up to 1030. Prove the conjectures by finding at least one prime for all lower values of k. The project is in collaboration with the Mersenne CRUS project.
The server is running on a private computer in a VM.
The invitation code for creating new accounts is pillepalle
You can only create new accounts over the website.
Project people:
- gd_barnes - CRUS admin - results
- Odicin - scripts
- walli - coding/scripts
- rebirther - SRBase admin
Project status:
- Riesel Base: 409/1032 proven (23.03.2025)
- Sierpinski Base: 403/1032 proven (12.10.2025)
27 unstarted bases (15.01.2026)
6 bases partially tested (15.01.2026)
About Trial Factoring
is a subproject for GPU Trial Factoring of Mersenne Prime candidates
Project people:
- rebirther - admin
- DeleteNull - coding
- Prime95 - GIMPS admin / work distribution
Join SRBase
Returning participants
Community
Infos
Published papers
Hardware requirements
- non AVX AMD/Intel CPU 2.3Ghz+
- Recommended: AVX,AVX2/FMA3/AVX512 compatible AMD/Intel CPU 2.3Ghz+, HT off
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User of the day
  DrBob       
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News
base S161 - 2 Megaprimes
Sightus@CAU, a member of the team Planet 3DNow! found a megaprime for base S161.
The prime 1600*161^456616+1 has 1.007.676 digits digits and entered the T5k PrimePages.
Sightus@CAU, a member of the team Planet 3DNow! found a megaprime for base S161.
The prime 892*161^495304+1 has 1.093.053 digits digits and entered the T5k PrimePages.
10 Jan 2026, 12:23:44 UTC
· Comment
base S178 Megaprime
Sightus@CAU, a member of the team Planet 3DNow! found a megaprime for base S178.
The prime 126*178^468180+1 has 1.053.604 digits digits and entered the T5k PrimePages.
10 Jan 2026, 12:21:44 UTC
· Comment
CRUS goals for 2026 released
2026 project goals
Recommended bases and efforts
1 Jan 2026, 16:31:43 UTC
· Comment
SRBase - 11 years review
The project has passed the 11th year...
Compared with last years the following process was made:
2014-2015 - 1 base proven, 314 bases unstarted
2015-2016 - 5 bases proven, 297 bases unstarted
2016-2017 - 5 bases proven, 282 bases unstarted
2017-2018 - 1 base proven, 264 bases unstarted
2018-2019 - 6 bases proven, 218 bases unstarted
2019-2020 - 4 bases proven, 120 bases unstarted
2020-2021 - 3 bases proven, 101 bases unstarted
2021-2022 - 0 bases proven, 97 bases unstarted
2022-2023 - 3 bases proven, 69 bases unstarted
2023-2024 - 4 bases proven, 69 bases unstarted
2024-2025 - 3 bases proven, 28 bases unstarted
in total - 35 bases proven, 28 bases unstarted
With the new pythonscript, available for windows, linux is planned later, we have decreased unstarted bases by a lot on manual testing.
There were many improvements like less RAM consumption and memory usage, and better distribution of workspaces among the workers.
Thx to all participated users who made this possible!
All 2025 goals are done earlier and some 2026 goals were already started.
Unfortunately, all TF applications need to be renewed, which is why all results from the GIMPs server will be rejected after the 31st except mfakto apps earlier.
31 Dec 2025, 9:45:51 UTC
· Comment
base R198 - 2 Megaprimes
3XyQWnaYY7oHngexisi4Po1kfgce found a megaprime for base R198.
The prime 3342*198^466948-1 has 1.072.427 digits and entered the T5k PrimePages.
SkyHighWeFly, a member of the team Antarctic Crunchers found a megaprime for base R198.
The prime 484*198^491623-1 has 1.129.097 digits and entered the T5k PrimePages.
30 Dec 2025, 14:24:04 UTC
· Comment
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