Top persons sorted by score
(Another of the Prime Pages' resources)
The Largest Known Primes Icon
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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

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.

41 Michael Curtis 46 49.8990
42 Peyton Hayslette 1 49.8982
43 Borys Jaworski 19 49.8344
44 Derek Gordon 1 49.7454
45 Patrice Salah 1 49.7436
46 Honza Cholt 29 49.6170
47 Michael Goetz 4 49.5303
48 Grzegorz Granowski 69 49.3556
49 Ars Technica Team Prime Rib 1 49.2624
50 Ralf Terber 18 49.1632
51 Walter Darimont 2 49.1458
52 Randy Ready 13 49.1180
53 Andrew M Farrow 5 49.0549
54 Ken Ito 12 49.0472
55 Daniel Thonon 78 49.0429
56 Predrag Kurtovic 22 49.0283
57 Sean Humphries 7 49.0192
58 Denis Iakovlev 1 48.9974
59 Martin Vanc 1 48.9657
60 Senji Yamashita 26.3333 48.9435

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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)).