New poster!

New largest prime number! The prime is 232582657-1, discovered in Sep. 2006.

New hardware!

Our bTop-2 lab hardware connects Mac OS X (and new! Windows) to the real world.
Now with UNIX, C, and REALBasic support!

PSI offers unique services that are hard to find elsewhere. We specialize in industrial algorithm problems.

Contact us for professional help on your algorithm problems.

PSI designs and supports laboratory peripherals for Mac OS X. More details can be found on our hardware page.

PSI has software available for free download under this license.

PrimeKit
GiantInt
AlgorithmSampler
FastAlgorithms

PSI also provides a unique collection of scientific souvenirs and gifts.

Visit our store to find posters and other scientific paraphernalia.