A new largest know prime number was found by N. Hajratwala, G. Woltman and S. Kurowski. The new prime was discovered on a volunteer distributed computing network. The previous three largest prime numbers were found with the same algorithm.
PSI sells an attractive wall poster displaying the entire number in decimal.
Our free release GiantInt now has an improved program for finding factors of Fermat numbers. You simply download 'giantint' and follow the compile instructions atop the new source 'fermat.c'. For prize details see the Prize page. In keeping with PSI's mission to distribute ideas as freely as possible, PSI offers free technical papers in PostScript and other formats. These are on the subjects of transforms and convolution, and are written by the PSI founder and PSI colleagues.