Ariane M. Masuda and Michael E. Zieve:
Nonexistence of permutation binomials of certain shapes,
Electronic J. Combinatorics 14 (2007), N12. MR 2008c:11162

(The published version and the arXiv version are available online.)

Suppose  xm+cxn  is a permutation polynomial over  Fp,  where  p > 5  is prime and  m > n > 0  and  c  is a nonzero element of  Fp.  We prove that  gcd(m-np-1)  is neither 2 nor 4. In the special case that either  (p-1)/2  or  (p-1)/4 is prime, this had been conjectured by Masuda, Panario and Wang.

Additional comment from July 2007:  We have generalized this result in a subsequent paper.


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