Samuel Yates began, and this site continues, a database of the largest known primes. Primes in that database are assigned a proof-code to show who should be credited with the discovery as well as what programs and projects they used. (Discoverers have one prover-entry, but may have many proof-codes because they use a variety of programs...)
This page provides data on L520, one of those codes.
Code name (*): L520 Persons (*): 1 (counting humans only) Projects (*): 2 (counting projects only) Display (HTML): Marks, NewPGen, PrimeGrid, TPS, LLR Number of primes: total 4 Unverified Primes: 0 (prime table entries marked 'Composite','Untested', or 'InProcess' Score for Primes (*): total 40.9515
Below is additional information about this entry.
Display (text): Marks, NewPGen, PrimeGrid, TPS, LLR Display (short): Marks Database id: 3475 (do not use this database id, it is subject to change) Proof program: LLR Entry last modified: 2021-11-29 08:37:16