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On the diophantine equation ( x m + 1 ) ( x n + 1 ) = y ²

Maohua Le (1997)

Acta Arithmetica

1. Introduction. Let ℤ, ℕ, ℚ be the sets of integers, positive integers and rational numbers respectively. In [7], Ribenboim proved that the equation    (1) ( x m + 1 ) ( x n + 1 ) = y ² , x,y,m,n ∈ ℕ, x > 1, n > m ≥ 1, has no solution (x,y,m,n) with 2|x and (1) has only finitely many solutions (x,y,m,n) with 2∤x. Moreover, all solutions of (1) with 2∤x satisfy max(x,m,n) < C, where C is an effectively computable constant. In this paper we completely determine all solutions of (1) as follows.   Theorem. Equation (1)...

On the diophantine equation x y - y x = c z

Zhongfeng Zhang, Jiagui Luo, Pingzhi Yuan (2012)

Colloquium Mathematicae

Applying results on linear forms in p-adic logarithms, we prove that if (x,y,z) is a positive integer solution to the equation x y - y x = c z with gcd(x,y) = 1 then (x,y,z) = (2,1,k), (3,2,k), k ≥ 1 if c = 1, and either ( x , y , z ) = ( c k + 1 , 1 , k ) , k ≥ 1 or 2 x < y m a x 1 . 5 × 10 10 , c if c ≥ 2.

On the Diophantine equation x² - dy⁴ = 1 with prime discriminant II

D. Poulakis, P. G. Walsh (2006)

Colloquium Mathematicae

Let p denote a prime number. P. Samuel recently solved the problem of determining all squares in the linear recurrence sequence {Tₙ}, where Tₙ and Uₙ satisfy Tₙ² - pUₙ² = 1. Samuel left open the problem of determining all squares in the sequence {Uₙ}. This problem was recently solved by the authors. In the present paper, we extend our previous joint work by completely solving the equation Uₙ = bx², where b is a fixed positive squarefree integer. This result also extends previous work of the second...

On the diophantine equation x²+x+1 = yz

A. Schinzel (2015)

Colloquium Mathematicae

All solutions of the equation x²+x+1 = yz in non-negative integers x,y,z are given in terms of an arithmetic continued fraction.

On the diophantine equation xp - x = yq - y.

Maurice Mignotte, Attila Petho (1999)

Publicacions Matemàtiques

We consider the diophantine equation(*)    xp - x = yq - y in integers (x, p, y, q). We prove that for given p and q with 2 ≤ p &lt; q, (*) has only finitely many solutions. Assuming the abc-conjecture we can prove that p and q are bounded. In the special case p = 2 and y a prime power we are able to solve (*) completely.

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