where p indicates the earliest previous bit included in the sequence (a, and the first p bits are provided; the constant c has been set equal to zero. There is a maximum of 2distinct possible iterations before sequence repeats itself.Interesting is the existence of sequences with only two non-zero coefficients, i.e. b is of the form

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where p indicates the earliest previous bit included in the sequence (a $_{p}=1)\protect$ , and the first p bits are provided; the constant c has been set equal to zero. There is a maximum of 2 $^{p}-1\protect$ distinct possible iterations before sequence repeats itself.Interesting is the existence of sequences with only two non-zero coefficients, i.e. b $_{i}$ is of the form

b $_{i}$ =(b $_{i-q}+b_{i-q})$ mod 2=b $_{i-q}\oplus b_{i-p}$

Amaury LATAILLADE 2002-11-04