For Mlucas users who (as I did) grabbed some of
the small exponents < 4.51M which George put on
the server for triple-checking yesterday, note
that you'll want to add a line for 224K FFT length
to your mlucas.cfg file. For this runlength, this
available FFT radix sets are indexed 0-4; 0 works
best on my Alpha ev4, whereas 2 is best on my ev56.
So, e.g. on the ev56, my .cfg file now looks like

..
#
224    2    # <=== new runlength and radix set index
256    ...

Cheers,
-Ernst

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