m-sequence generation program using a search algorithm

Generates maximum length sequences (m-sequences) of length a^b-1, where a is any prime number <=31

Description

Maximum length sequence assuming distinct
values = baseVal^powerVal-1

        [ms]=mseqSearch(powerVal,baseVal)
 
        OUTPUT:
          ms: generated maximum length sequence, of length
                    basisVal^powerVal-1 such that all values occur
                    with equal frequency=basisVal except zero,
                    which occurs basisVal-1 times
 
           INPUT:
  baseVal: any prime number up to 31
                  powerVal: an integer
           NB: the algorithm is performing search in m-sequence
                  register space so the calculation time grows with
                   baseVal and powerVal
                   Tested on Matlab 7.9.0 (R2009b)
 
  (C) Written by Giedrius T. Buracas, SNL-B, Salk Institute
                    and Center for Functional MRI, UCSD

• MATLAB release: MATLAB 7.9 (2009b)

[Karin]

Everything is working well. I just wondered if I could ask a question: My understanding is that in theory it is possible to create m-sequences when the number of levels is a power of a prime integer (so, for example,for an experiment that uses 9 stimuli). Is that possible within this program, or can I only generate sequences in which the number of levels is a prime integer?