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  • 1 Department of Mathematics, University of Zagreb, Bijenička cesta 30, 10000 Zagreb, Croatia
  • 2 Instituto de Matemáticas, Universidad Nacional Autónoma de México, C.P. 58089 Morelia, Michoacán, México
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In this paper, given a pair of odd coprime integers δ and ɛ, we study the positive n such that (n2 + 1)/2 has two divisors d1 and d2 summing up to δn + ɛ.