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Old 2008-10-01, 22:30   #3
fivemack
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Feb 2006
Cambridge, England

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I did the linalg for 2-821 a few months back; significant oversieving meant the matrix was

Sat Jun 7 13:07:34 2008 found 84366768 hash collisions in 266645965 relations
Sat Jun 7 13:07:34 2008 commencing duplicate removal, pass 2
Sat Jun 7 13:44:41 2008 found 52049651 duplicates and 214596314 unique relations
Sun Jun 8 17:52:47 2008 matrix is 10129794 x 10130042 (2798.1 MB) with weight 690519820 (68.17/col)

and took 375 hours on a 4GB quad-core. So I'm not particularly surprised that 2^823 \pm 1 didn't take all that long ... the way msieve does filtering makes oversieving decidedly profitable.
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