News - February 2009

Feb 26, 2009
10^15501-1: 5342794743199.
10^30110L+1: 3641316992217280732201.
10^30130L+1: 31602866242561.
10^30470L+1: 11156178789361.
10^30490M+1: 54411167716967461.

Feb 25, 2009
10^17110L+1: 75127795805328243966661.
10^27510L+1: 478348049635681.
10^27630L+1: 12439067053593421.
10^27750L+1: 81235496686501.
10^27770L+1: 3238569866851181.

Feb 24, 2009
10^28350L+1: 321661997785044001.

Feb 23, 2009.
Factorizations of numbers of the form 2009^n - 1 (n ≤ 130) (1st release, see http://www.AlfredReich.com/Phin2009.html)
A nice catch was the 44-digit factor 49230307783242999708854545591243466556756701 of 2009^100-1. 
A P-1 search (with B1=1e8) was successful, since 49230307783242999708854545591243466556756701-1 = 2^2.5^2.37.39107.13132489.27322721.35019203.27076908327059.

Feb 2, 2009

815^83-1: 31503930496287669359364221491.
1031^83-1: 4288916693248494546120009407963.
1031^83-1: 26822209034360146560578481138007.

Alfred Reich