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 L4561, one of those codes.

Code name (* ):L4561 (See the descriptive data below.)
Persons (* ):2 (counting humans only)
Projects (* ):1 (counting projects only)
Display (HTML) :Propper , Batalov , CycloSv , Cyclo , EMsieve , PIES , LLR
Number of primes :total 5
Unverified Primes :0 (prime table entries marked 'Composite','Untested', or 'InProcess')
Score for Primes (* ):total 51.7785, on current list 51.7785 (normalized score 2811)
Entrance Rank (* ):mean 382.40 (minimum 12, maximum 477)

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Descriptive Data:
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P.I.E.S. is the decade-old project to search for primes of
the form Φ_{m} (b) where m is a 3-smooth number.
Yves Gallot's Cyclo program (both CPU and GPU
implementations) can be used for m = 3 * 2^{n} .
Prime95 with the option PhiExtensions=1 (or LLR with
modifications) can be used for m = 3^{v} *
2^{n} , where v<=2; for v=1, this is 1.25-1.5x
slower than CycloCPU but the range of values of b is 1.5x
wider.
In addition, Prime95 (and LLR ver. >= 3.8.19) can be
run in multi-threaded mode, so the double-check can be an
order of magnitude faster than the intitial test.

Below is additional information about this entry.

Display (text): Propper, Batalov, CycloSv, Cyclo, EMsieve, PIES, LLR
Display (short): Propper & Batalov
Database id: 8426 (do not use this database id, it is subject to change)
Proof program: LLR The primes from this code accounts for 0.104% of the (active) primes and 4.565% of the (active) score for this program.
Entry last modified: 2018-04-23 00:20:44