GIMPS - The Great Internet Mersenne Prime Search

Using the computers of my former employer Universität Dortmund I have participated in the prime search of the GIMPS project. The following numbers of the form 2i-1 are not prime:

prime    fact    Lucas-Lehmer residue or factor
exponent bits    [residues partially masked]      
   i
-------- ---- -- -------------------------------- 
 5226839  62  D  0x2E95D9CFD7197E__               
 5558221  63  D  0x22D47F2421B8A7__               
 9516811  64     0x109C01C4F10569__		  
 9731213  64     0xF4AAD9D80ABF38__               
 9774451  64     0x4F563D367597A3__               
 9783649  64     0x0FB76706D7A341__               
 9829987  64     0x4CB81D27F7439A__               
10415347  64     0xEAB37A4CFBF9F5__               
10428797  64     0x0F97AB7FAD6B5F__               
10428937  64     0x0A17BD65A44971__               
 
Factored composite    :      0
Lucas-Lehmer composite:      8
Double-checked LL     :      2
---------------------- -------
                TOTAL :     10

More about the GIMPS project can be found at mersenne.org.

Robert Garmann, February 22, 2002
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