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 2010-04-08, 22:20 #19 kar_bon     Mar 2006 Germany 24·173 Posts The standard Nash-weight was defined as n-values remaining after sieving the range 100001<=n<=110000 up to p=511. So with srsieve the command Code: srsieve -n 100001 -N 110000 -P 511 "301*2^n-1" prints 2254 candidates left for Riesel Base 2 k=301. The small program 'nash' from T.Ritschel given here calculates a weight of 2158 for this k-value. I'm using this program to show the Nash weights on www.rieselprime.de for all k-values. Doing a script for some values should work with all bases and result in a compareable value for all.