There is no greater mistake than to call arithmetic an exact science. There are [...] hidden laws of number which it requires a mind like mine to perceive. For instance, if you add a sum from the bottom up, and then again from the top down, the result is always different.

Maria La Touche (The letters of a noble woman, 1878)

February 21, 2018
Primo 4.3.0 (executable for Linux 64-bit).
Primo is a primality proving program based on the ECPP (Elliptic Curve Primality Proving) algorithm. With Primo one can quickly check whether crypto-primes are actually prime... or not.

November 18, 2017
New Primo (and ECPP) record: 34987 decimal digits! This number is the largest "ordinary" prime proven to date.

May 9, 2016
ECB 2.0.4 (executable for Linux 64-bit).
ECB - Elliptic Curve Builder - is a generator of ordinary elliptic curves. The curves over GF(P), GF(2N) and GF(3N) are built using the so-called complex multiplication method.

April 2, 2015
First ECB release for Linux.

April 28, 2013
The old monoprocessor version of Primo for Windows is no more distributed.

April 24, 2011
The NX and CPG softwares are no more distributed.

April 4, 2011
First Primo release for Linux.

May 28, 2009
Factoring Class Polynomials over the Genus Field.
All the references to the patent pending (WO/2005/004383) double-eta quotient invariants have been suppressed.
The Internet links have been updated.

April 10, 2007
An unexpected use of Primo:

August 3, 2001
First Primo release.

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