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Look up single exponent:
Look up factor:
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by range
Look up many exponents:
List of Mersenne Prime numbers
GIMPS progress visualization
Look up exponent / factor
Aliquot Sequences
Prime95 benchmarks
Calculate CPU Credit for any assignment
Estimated GPU trial-factoring performance
Estimated GPU PRP performance
P-1 probability calculator
P+1 Factors
Factors missed by P-1
Factors missed by TF
Exponents with gaps in TF
Exponents with less TF than expected
Exponents with the most known factors
P-1 factors found via Brent-Suyama
Gerbicz probably-PRP
P-1 bounds on unfactored unverified
Smoothest P-1 factors
Biggest P-1 / ECM factors
Recent factors by user
Top TF factor finding users
Top discoverers by factor size
Recently discovered factors by size
TJAOI progress
SRBase factor distribution
TWOK progress
P-1 vs PRP at wavefront
PRP vs TF bitlevel
LL tests done per day
CERT tests done per day
Probably-Prime (PRP) cofactors
Trial-factoring assignment >1000M (tf1G)
Operation Billion Digits (OBD)
Worktodo balancer
Split large assignment blocks to workers
Sort Strings by Length
Worktodo skip known-factor assignments
P-1 to TF worktodo rewriter
TF worktodo bit level split
TF worktodo bit level merge
TF worktodo filter for previous ECM/TF effort
Factoring Beyond First Factor
LL-DC priority assignments
mfactor/factor5 results to JSON converter
P-1 effort distribution
TF distribution for factored exponents
Exponents that were poorly P-1 factored
Factor discovery date lookup
FactorDB composite size distribution history
FactorDB site status and reports
YAFU JSON factors to FactorDB converter
Results to BBcode factor results converter
Graphs of Known Factors
0M
<
10
10
All tracked exponents
0M
<
2
32
GPU TF range
0M
<
1000M
PrimeNet range
0M
<
193M
low-PrimeNet, low-res
0M
<
385M
low-PrimeNet, high-res
50M
<
146M
PrimeNet wavefront
Trial-Factoring bit-depth lookup
Prime Factorization for small numbers
Calculate decimal digits in Mersenne number
Convert GIMPS Factoring Effort to PFactor
External Links:
Mersenne Forum
Prime Wiki
GPU to 72
by
Chris Halsall
GIMPS Status
Factorization using ECM
Mersenne software download mirror
Donations:
Donate to MersenneForum + mersenne.ca
Donate to mersenne.org / GIMPS
Calculate bit size of factor:
Pages related to
factordb.com
FactorDB Composite Factors Distribution history report
factordb_stat1.html
= mirror snapshot of
stat_1
(last updated 2026-08-11 16:32:26, 6.1 minutes ago)
factordb_status.html
= mirror snapshot of
status
(last updated 2026-08-11 16:04:02, 34.5 minutes ago)
factordb-worker
- my PHP worker script to fetch-factor-submit unfactored composites (requires
YAFU v3.0+
). Works on both Linux and Windows.
Recent uptime monitoring:
(last 48 hours): success rate 85%
2026-08-09 12:00
2026-08-09 18:00
2026-08-10 00:00
2026-08-10 06:00
2026-08-10 12:00
2026-08-10 18:00
2026-08-11 00:00
2026-08-11 06:00
2026-08-11 12:00
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