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reviewed

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(PARI)

(PARI) { { F2(n)=local(t, , t1, , t2, , tmp):); t1=Mod(0, , 2):); t2=Mod(1, , 2):); t=Mod(1, , 2)*x:; for(k=2, , n, , tmp=t*t2-t1:; t1=t2:; t2=tmp):); tmp }

(PARI) for(n=2, , 200, , t=F2(n): ); if(gcd(t, , subst(t, , x, , 1-x))!=1, , print1(n", ")))", ")))

approved

editing

Colin Barker: Replaced colons by semicolons in PARI code so that it can be executed using recent versions of PARI.

proposed

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M. Hunziker, A. Machiavelo and J. Park, <a href="http://wwwdx.sciencedirectdoi.com/science/articleorg/pii10.1016/S0304397504001823j.tcs.2004.03.031">Chebyshev polynomials over finite fields and reversibility of sigma-automata on square grids</a>, Theoretical Comp. Sci., 320 (2004), 465-483.

approved

editing

Michel Marcus: replaced sciencedirect with doi link
goes same place

reviewed

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proposed

reviewed

editing

proposed