On the exceptional set of Lagrange’s equation with three prime and one almost–prime variables

Tolev, Doychin

Journal de théorie des nombres de Bordeaux, Tome 17 (2005) no. 3, pp. 925-948.

Nous considérons une version affaiblie de la conjecture sur la représentation des entiers comme somme de quatre carrés de nombres premiers.

We consider an approximation to the popular conjecture about representations of integers as sums of four squares of prime numbers.

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