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It is well-known that for $p=1, 2, 3, 7, 11, 19, 43, 67, 163$, the class number of $mathbb{Q}(sqrt{-p})$ is one. We use this fact to determine all the solutions of $x^2+p^m=4y^n$ in non-negative integers $x, y, m$ and $n$.
In this paper, we study the generalized Lebesgue-Nagell equation [ x^2+7^{2k+1}=y^n. ] This is the last case of equations of the form $x^2+q^{2k+1}=y^n$ with $kgeq0$ and $q>0$ where $mathbb{Q}(sqrt{-q})$ has class number one. Our proof is based on the modular method and the symplectic argument.
For R(z, w) rational with complex coefficients, of degree at least 2 in w, we show that the number of rational functions f(z) solving the difference equation f(z+1)=R(z, f(z)) is finite and bounded just in terms of the degrees of R in the two variabl
We define a new kind of classical digamma function, and establish its some fundamental identities. Then we apply the formulas obtained, and extend tools developed by Flajolet and Salvy to study more general Euler type sums. The main results of Flajol
This paper is concerned with a class of partition functions $a(n)$ introduced by Radu and defined in terms of eta-quotients. By utilizing the transformation laws of Newman, Schoeneberg and Robins, and Radus algorithms, we present an algorithm to find
Using the $q$-Wilf--Zeilberger method and a $q$-analogue of a divergent Ramanujan-type supercongruence, we give several $q$-supercongruences modulo the fourth power of a cyclotomic polynomial. One of them is a $q$-analogue of a supercongruence recent