In a website, do not directly link to the certificates (it will not work) but link to this page.


Primo record

Phi(13338,63847)
44250132909040111
18666 decimal digits

The certification of this number was done by Tom Wu with Primo 4.0.1. It took about six months on (mainly) a Phenom II X6 1090T.


20 greatest numbers certified with Primo
Factor of Phi(13338,63847)
18666 decimal digits
 Certified by Tom Wu (US, 2013) [more...]
Certificate: ecpp18666.7z (13.4 MiB)
261792 + 21661
18602 decimal digits
 Certified by Peter Kaiser (EU, 2012) [more...]
Certificate: ecpp18602.7z (12.9 MiB)
256366 + 39079
16968 decimal digits
 Certified by Peter Kaiser (EU, 2012) [more...]
Certificate: ecpp16968.7z (10.9 MiB)
39161# ÷ 2310 - 510478
16901 decimal digits
 Certified by Pierre Cami (EU, 2013)
Certificate: ecpp16901.7z (11.3 MiB)
6521953289619 × 255555 - 5
16737 decimal digits
 Certified by Peter Kaiser (EU, 2013) [more...]
Certificate: ecpp16737.7z (11.7 MiB)
Phi(47184,10)
15713 decimal digits
 Certified by Ray Chandler (US, 2013)
Certificate: ecpp15713.7z (10.2 MiB)
Factor of Phi(13680,26371)
15267 decimal digits
 Certified by Tom Wu (US, 2012) [more...]
Certificate: ecpp15267.7z (8.7 MiB)
728192 + 438192
15216 decimal digits
 Certified by Youcef Lemsafer (EU, 2012) [more...]
Certificate: ecpp15216.7z (10.1 MiB)
Phi(40120,10)
14848 decimal digits
 Certified by Ray Chandler (US, 2013) [more...]
Certificate: ecpp14848.7z (8.9 MiB)
Factor of Phi(11490,38284)
13956 decimal digits
 Certified by Tom Wu (US, 2013) [more...]
Certificate: ecpp13956.7z (8.3 MiB)
Phi(3243,-2399401) ÷ 33320592661
12903 decimal digits
 Certified by Tom Wu (US, 2010) [more...]
Certificate: ecpp12903.zip (8.2 MiB)
Factor of (6 × Bern(5078))
12533 decimal digits
 Certified by Thomas Ritschel (EU, 2013) [more...]
Certificate: ecpp12533.7z (7.3 MiB)
Factor of (241521 - 1)
12459 decimal digits
 Certified by Tom Wu (US, 2012) [more...]
Certificate: ecpp12459.7z (6.9 MiB)
Factor of (241263 - 1)
12395 decimal digits
 Certified by David Metcalfe (EU, 2012) [more...]
Certificate: ecpp12395.7z (5.8 MiB)
p(120052048)
12198 decimal digits
 Certified by David Metcalfe (EU, 2012) [more...]
Certificate: ecpp12198.7z (5.9 MiB)
Factor of Phi(5655,34120)
12155 decimal digits
 Certified by Tom Wu (US, 2011) [more...]
Certificate: ecpp12155.zip (7.0 MiB)
238090 + 47269
11467 decimal digits
 Certified by Norman Luhn (EU, 2010)
Certificate: ecpp11467.zip (7.4 MiB)
p(100077222)
11136 decimal digits
 Certified by David Metcalfe (EU, 2012) [more...]
Certificate: ecpp11136.7z (4.8 MiB)
Factor of (1258566 × Bern(4462))
10763 decimal digits
 Certified by David Metcalfe (EU, 2013) [more...]
Certificate: ecpp10763.7z (5.0 MiB)
811889 + 118898
10737 decimal digits
 Certified by Andrey Kulsha (Belarus, 2012)
Certificate: ecpp10737.zip (6.5 MiB)


ECPP records set with Primo
(32 × 106959 - 23) ÷ 99
6959 decimal digits
 Certified by Hans Rosenthal (EU, 2003).
Certificate: ecpp6959.zip (4.3 MiB)
16282536 ... 36478311
5878 decimal digits
 Certified by Jose Luis Gomez Pardo (EU, 2003).
Certificate: ecpp5878b.zip (3.1 MiB)
105019 + 43157099231631693
5020 decimal digits
 Certified by Giovanni and Marco La Barbera (EU, 2001).
Certificate: ecpp5020.zip (2.1 MiB)
103999 + 4771
4000 decimal digits
 Certified by Giovanni and Marco La Barbera (EU, 2001).
Certificate: ecpp4000.zip (1.3 MiB)
(3481223 - 1) ÷ 347
3106 decimal digits
 Certified by Giovanni and Marco La Barbera (EU, 2001).
(301789 - 1) ÷ 29
2642 decimal digits
 Certified by Giovanni and Marco La Barbera (EU, 2000).

Since 2003, 64-bit distributed versions of ECPP have established new records (notice that, up to now, these programs have never been released by their respective authors).


Other primes

Links to some pages reporting primes certified with Primo:

Valid XHTML 1.0 Strict