Top persons sorted by score
(Another of the Prime Pages' resources)
The Largest Known Primes Icon
  View this page in:   language help
 
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 David Metcalfe 199 49.8654
26 Dmitry Domanov 42 49.8111
27 Derek Gordon 1 49.7454
28 Patrice Salah 1 49.7436
29 Thomas Ritschel 72 49.6858
30 Stefan Larsson 35 49.5258
31 Michael Goetz 2 49.5188
32 Borys Jaworski 18 49.4841
33 Tom Greer 135 49.4816
34 Grzegorz Granowski 100 49.4674
35 Ronny Willig 37 49.3870
36 Ars Technica Team Prime Rib 1 49.2624
37 Michael Curtis 40.5 49.1586
38 Walter Darimont 2 49.1458
39 Randy Ready 13 49.1180
40 Hiroyuki Okazaki 40 49.0529

move up list ^
move down list v

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)).