Primo record

LR(691,1523)
23770 decimal digits

The certification of this number was done by Philippe Alsina, Pierre Gazzano, Nik Lygeros, Olivier Rozier and André Solaris with Primo 4.0.3. It took about eight months on 32 threads (bi-Xeon).


20 greatest numbers certified with Primo
Lehmer-Ramanujan(691,1523)
23770 decimal digits
Certified by Philippe Alsina, Pierre Gazzano, Nik Lygeros, Olivier Rozier and André Solaris (EU, 2014)
Certificate: ecpp23770.7z (23.1 MB)
273845 + 14717
22230 decimal digits
Certified by Peter Kaiser (EU, 2013) [more...]
Certificate: ecpp22230.7z (19.1 MB)
(263703 - 1) ÷ 42808417
19169 decimal digits
Certified by David Metcalfe (EU, 2014) [more...]
Certificate: ecpp19169.7z (15.4 MB)
Lucas(89849)
18778 decimal digits
Certified by Paul Underwood (EU, 2014) [more...]
Certificate: ecpp18778.7z (14.5 MB)
primV(145353)
18689 decimal digits
Certified by Dana Jacobsen (US, 2013) [more...]
Certificate: ecpp18689.7z (14.2 MB)
Phi(59772,10)
18688 decimal digits
Certified by Ray Chandler (US, 2014)
Certificate: ecpp18688.7z (14.6 MB)
Factor of Phi(13338,63847)
18666 decimal digits
Certified by Tom Wu (US, 2013) [more...]
Certificate: ecpp18666.7z (13.4 MB)
587 × 43103# ÷ 2310 + 657402
18662 decimal digits
Certified by Pierre Cami (EU, 2013) [more...]
Certificate: ecpp18662b.7z (14.4 MB)
587 × 43103# ÷ 2310 - 455704
18662 decimal digits
Certified by Pierre Cami (EU, 2013) [more...]
Certificate: ecpp18662.7z (13.8 MB)
261792 + 21661
18602 decimal digits
Certified by Peter Kaiser (EU, 2012) [more...]
Certificate: ecpp18602.7z (12.9 MB)
Lucas(81671)
17069 decimal digits
Certified by Mathew Steine (EU, 2013) [more...]
Certificate: ecpp17069.7z (11.4 MB)
256366 + 39079
16968 decimal digits
Certified by Peter Kaiser (EU, 2012) [more...]
Certificate: ecpp16968.7z (10.9 MB)
39161# ÷ 2310 - 510478
16901 decimal digits
Certified by Pierre Cami (EU, 2013)
Certificate: ecpp16901.7z (11.3 MB)
6521953289619 × 255555 - 5
16737 decimal digits
Certified by Peter Kaiser (EU, 2013) [more...]
Certificate: ecpp16737.7z (11.7 MB)
Lehmer-Ramanujan(571,1091)
16526 decimal digits
Certified by Dimitris Katsios, Nik Lygeros and Olivier Rozier (EU, 2013)
Certificate: ecpp16526.7z (11.9 MB)
Lehmer-Ramanujan(79,1571)
16386 decimal digits
Certified by Nik Lygeros, Gerasimos Politis and Olivier Rozier (EU, 2014)
Certificate: ecpp16386.7z (12.9 MB)
Lehmer-Ramanujan(673,1019)
15834 decimal digits
Certified by Patrice Deloche, Nik Lygeros and Olivier Rozier (EU, 2013)
Certificate: ecpp15834.7z (11.0 MB)
Phi(47184,10)
15713 decimal digits
Certified by Ray Chandler (US, 2013) [more...]
Certificate: ecpp15713.7z (10.2 MB)
Factor of Phi(13680,26371)
15267 decimal digits
Certified by Tom Wu (US, 2012) [more...]
Certificate: ecpp15267.7z (8.7 MB)
728192 + 438192
15216 decimal digits
Certified by Youcef Lemsafer (EU, 2012) [more...]
Certificate: ecpp15216.7z (10.1 MB)


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

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