Status on Riesel base 256: Now up to n=12.5K on all k's. 65 k's remaining. About 8-10 more k's can be removed with base 2 primes shown at rieselprime.org but I'm leaving them in to see if there are lower primes, at least until n=25K.
I will be continuing on to n=25K after doing a little more sieving.
If you've never messed around with a HUGE base before, it's a trip!
Gary