%N Largest number x such that the greatest prime factor of x^2-2 is A038873(n), the n-th prime not congruent to 3 or 5 mod 8.
%C For any prime p, there are finitely many x such that x^2-2 has p as its largest prime factor.
%H Filip Najman, <a href="http://web.math.hr/~fnajman/smooth.pdf">Smooth values of some quadratic polynomials</a>, Glasnik Matematicki Series III 45 (2010), pp. 347-355.
%H Filip Najman, <a href="http://web.math.hr/~fnajman/">Home Page</a> (gives all 537 numbers x such that x^2-2 has no prime factor greater than 199)
%Y Equivalents for other polynomials: A175607 (x^2 - 1), A145606 (x^2 + x), A185389 (x^2 + 1).
%A _Charles R Greathouse IV_, Feb 21 2011