Todorova, T. L., Sofia University "St.Kl. Ohridsky", Bulgaria
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Vol 59 (2014): Number Theory '14 - Articles
On the equation $x^2_1 + x^2_2 + x^2_3 + x^2_4 = N$ with variables such that $x_1 x2_ x_3 x_4 + 1$ is an almost-prime
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ISSN: 1338-9750