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 x1, one of those codes.
Code name (*): x1 (See the descriptive data below.) Persons (*): 3 (counting humans only) Projects (*): 0 (counting projects only) Display (HTML): Steward, Broadhurst, Water, OpenPFGW, Primo Number of primes: total 1 Unverified Primes: 0 (prime table entries marked 'Composite','Untested', or 'InProcess' Score for Primes (*): total 32.6987
Below is additional information about this entry.
Display (text): Steward, Broadhurst, Water, OpenPFGW, Primo Display (short): Steward, Broadhurst & Water Database id: 279 (do not use this database id, it is subject to change) Proof program: unknown Entry last modified: 2021-07-31 01:37:56