Geodesic
Lagrange's four square theorem with almost-prime numbers having a special form
Mathematics and Education in Mathematics, Tome 50 (2021), pp. 163-175.

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In this paper we consider the Lagrange’s equation with almost-prime numbers satisfying a diophantine inequality. Разглеждаме проблем, свързан с теоремата на Лагранж за четирите квадрата с почти прости числа от подходящ ред, които удовлетворяват диофантово неравенство.
Keywords: Lagrange’s equation, almost-primes, quadratic irrational numbers, 11P05, 11N36, уравнение на Лагранж, почти прости числа, квадратни ирационални числа, 11P05, 11N36 
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     title = {Lagrange's four square theorem with almost-prime numbers having a special form},
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Todorova, Tatyana L. Lagrange's four square theorem with almost-prime numbers having a special form. Mathematics and Education in Mathematics, Tome 50 (2021), pp. 163-175. http://geodesic.mathdoc.fr/item/MEM_2021_50_a17/