Let 
be an integer and let
be an integer polynomial that has at least one real root. Then f(x) has infinitely many prime divisors that are not congruent to 1 (mod m) (Nagell 1951, p. 168).
Bauer's Identical Congruence, Prime Divisor
Nagell, T. "A Theorem of Bauer on the Prime Divisors of Certain Polynomials." §49 in Introduction to Number Theory. New York: Wiley, pp. 168-169, 1951.
Eric W. Weisstein. "Bauer's Theorem."
From MathWorld--A Wolfram Web Resource. http://mathworld.wolfram.com/BauersTheorem.html
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