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On the generation of the coefficient field of a newform by a single Hecke eigenvalue

Koopa Tak-Lun Koo, William Stein, Gabor Wiese (2008)

Journal de Théorie des Nombres de Bordeaux

Let f be a non-CM newform of weight k 2 . Let L be a subfield of the coefficient field of  f . We completely settle the question of the density of the set of primes p such that the p -th coefficient of  f generates the field  L . This density is determined by the inner twists of  f . As a particular case, we obtain that in the absence of nontrivial inner twists, the density is  1 for L equal to the whole coefficient field. We also present some new data on reducibility of Hecke polynomials, which suggest questions...

On the greatest prime factor of n 2 + 1

Jean-Marc Deshouillers, Henryk Iwaniec (1982)

Annales de l'institut Fourier

There exist infinitely many integers n such that the greatest prime factor of n 2 + 1 is at least n 6 / 5 . The proof is a combination of Hooley’s method – for reducing the problem to the evaluation of Kloosterman sums – and the majorization of Kloosterman sums on average due to the authors.

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