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Linear complexity of Legendre-polynomial quotients

Abstract

We continue to investigate binary sequence (fu)(f_u) over {0,1}\{0,1\} defined by (1)fu=((uwuwp)/pp)(-1)^{f_u}=\left(\frac{(u^w-u^{wp})/p}{p}\right) for integers u0u\ge 0, where (p)\left(\frac{\cdot}{p}\right) is the Legendre symbol and we restrict (0p)=1\left(\frac{0}{p}\right)=1. In an earlier work, the linear complexity of (fu)(f_u) was determined for w=p1w=p-1 under the assumption of 2p1≢1(modp2)2^{p-1}\not\equiv 1 \pmod {p^2}. In this work, we give possible values on the linear complexity of (fu)(f_u) for all 1w<p11\le w<p-1 under the same conditions. We also state that the case of larger w(p)w(\geq p) can be reduced to that of 0wp10\leq w\leq p-1.

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