Top persons sorted by score
(Another of the Prime Pages' resources)
The Largest Known Primes Icon
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The Prover-Account Top 20
Persons by: number score normalized score
Programs by: number score normalized score
Projects by: number score normalized score

At this site we keep several lists of primes, most notably the list of the 5,000 largest known primes. Who found the most of these record primes? We keep separate counts for persons, projects and programs. To see these lists click on 'number' to the right.

Clearly one 100,000,000 digit prime is much harder to discover than quite a few 100,000 digit primes. Based on the usual estimates we score the top persons, provers and projects by adding ‎(log n)3 log log n‎ for each of their primes n. Click on 'score' to see these lists.

Finally, to make sense of the score values, we normalize them by dividing by the current score of the 5000th prime. See these by clicking on 'normalized score' in the table on the right.

rankpersonprimesscore
21 Masashi Kumagai 2 49.9806
22 Tim McArdle 1 49.9091
23 Peyton Hayslette 1 49.8982
24 Peter Kaiser 33.3333 49.8826
25 Dmitry Domanov 44 49.8157
26 David Metcalfe 194 49.7935
27 Derek Gordon 1 49.7454
28 Patrice Salah 1 49.7436
29 Thomas Ritschel 69 49.6721
30 Michael Goetz 3 49.5219
31 Borys Jaworski 18 49.4841
32 Grzegorz Granowski 100 49.4674
33 Tom Greer 138 49.4343
34 Stefan Larsson 31 49.3686
35 Ars Technica Team Prime Rib 1 49.2624
36 Walter Darimont 2 49.1458
37 Randy Ready 13 49.1180
38 Hiroyuki Okazaki 52 49.1098
39 Michael Curtis 38.5 49.0434
40 Ronny Willig 33 49.0158

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Notes:


Score for Primes

To find the score for a person, program or project's primes, we give each prime n the score (log n)3 log log n; and then find the sum of the scores of their primes. For persons (and for projects), if three go together to find the prime, each gets one-third of the score. Finally we take the log of the resulting sum to narrow the range of the resulting scores. (Throughout this page log is the natural logarithm.)

How did we settle on (log n)3 log log n? For most of the primes on the list the primality testing algorithms take roughly O(log(n)) steps where the steps each take a set number of multiplications. FFT multiplications take about

O( log n . log log n . log log log n )
operations. However, for practical purposes the O(log log log n) is a constant for this range number (it is the precision of numbers used during the FFT, 64 bits suffices for numbers under about 2,000,000 digits).

Next, by the prime number theorem, the number of integers we must test before finding a prime the size of n is O(log n) (only the constant is effected by prescreening using trial division).  So to get a rough estimate of the amount of time to find a prime the size of n, we just multiply these together and we get

O( (log n)3 log log n ).
Finally, for convenience when we add these scores, we take the log of the result.  This is because log n is roughly 2.3 times the number of digits in the prime n, so (log n)3 is quite large for many of the primes on the list. (The number of decimal digits in n is floor((log n)/(log 10)+1)).