Mersenne prime factorization progress graphs

DescriptionResolutionImageVideo
Known factor bit depths for all exponents less than 232 (up to M4,294,967,295)4296x1000factor_bits_20260217.png
filesize: 185kB
video.mp4
filesize: 15.0MB
2026-Feb-15
Known factor bit depths for active PrimeNet range (up to M191,999,999)1920x1000factor_bits_100M_20260217.png
filesize: 170kB
video.mp4
filesize: 15.3MB
2026-Feb-15
Known factor bit depths for active PrimeNet range (up to M383,999,999)3840x1632factor_bits_384M_20260217.png
filesize: 396kB
video.mp4
filesize: 35.7MB
2026-Feb-15
Known factor bit depths for entire PrimeNet range (up to M999,999,999)1000x500factor_bits_1000M_20260217.png
filesize: 40kB
video.mp4
filesize: 4.5MB
2026-Feb-15
Known factor bit depths for entire mersenne.ca range (up to M9,999,999,999)10000x2000factor_bits_10G_20260217.png
filesize: 475kB
video.mp4
filesize: 17.5MB
2026-Feb-15
Known factor bit depths for PrimeNet wavefront (50M to 146M)960x480factor_bits_wavefront_20260217.png
filesize: 52kB
video.mp4
filesize: 4.6MB
2026-Feb-15
Known factor bit depths for PrimeNet wavefront (100M to 196M)960x480factor_bits_wavefront2_20260217.png
filesize: 49kB
video.mp4
filesize: 4.4MB
2026-Feb-15
See also: Recent Factors By Size
What do the curved lines on the graphs mean?
Back in the Ancient Times, before GPUs did computing, Prime95 had a default TF limit based on the break-even probability of proving an exponent composite by factoring or LL. When mfaktc came around that up-ended things and TF became much faster. Spearheaded by the GPU72 project, the TF target was initially raised +2 then +3 bit levels above the previous Prime95 CPU target. After some years when GPUs became even more ridiculously fast and widespread, the target was raised to +4 and there was talk of +5, although we backed off that and are working at +4 for the last long while now. So, for historical reasons that go back anywhere from 10 to 25+ years, the 3 lines on the graph are:The pink CPU limit line is irrelevant for the last 15 years (although, sadly, we do still see the occasional CPU TF result).
The blue line really should be at +4, and the cyan one might come into play if there's a surfeit of GPU power and people decide to go "one bit further" than target just because they can.