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In 1985, Robbins observed by computer the continued fraction expansion ofcertain algebraic power series over a finite field. Incidentally, he cameacross a particular equation of degree 4 in characteristic p=13. This equationhas an analogue for all primes p>=5. There are two patterns for the continuedfraction of the solution of this equation, according to the residue of p modulo3. We describe this pattern in the first case, considering especially p=7 andp=13. in the second case we only give indications.

On the continued fraction expansion of the unique root in F(p) of the equation x^4+x^2-Tx-1:12=0 and other related hyperquadratic expansions