Top persons sorted by score
(Another of the Prime Pages' resources)
The Largest Known Primes Icon
  View this page in:   language help
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.

21 Peter Benson 231 50.8958
22 Tom Greer 69 50.8272
23 Konstantin Agafonov 1 50.8197
24 Hiroyuki Okazaki 33 50.6794
25 Michael Schulz 1 50.5434
26 Wolfgang Schwieger 35 50.5417
27 Stefan Larsson 59 50.5274
28 Karsten Klopffleisch 1 50.5009
29 Roman Vogt 3 50.4948
30 Ronny Willig 155 50.4913
31 Serhiy Gushchak 1 50.4356
32 Ed Goforth 14 50.3947
33 Yair Givoni 1 50.3617
34 Sai Yik Tang 15 50.3508
35 Cesare Marini 1 50.3029
36 Peter Kaiser 47.3333 50.2596
37 Thomas Ritschel 93 50.2473
38 David Metcalfe 159 50.0082
39 Masashi Kumagai 2 49.9806
40 Dmitry Domanov 46 49.9299

move up list ^
move down list v


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)).