By request and by curtesy of Thomas here is the program to create tables such as above.
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The attached zip file contains the little tool "fft_len" which I used to get those numbers. You simply need to rename/copy the file matching your cpu architecture (either "maxlen_Athlon.txt" or "maxlen_P4.txt") to "maxlen.txt" and then run fft_len from the command line.
It asks for "k", "n_min" and "n_max" and then produces the list.
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