How to solve this question on number theory?
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Alternative proof that $(a^2+b^2)/(ab+1)$ is a square when it's an integer
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A Number Theory problem (GCD)
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Solving modular arithmetic questions
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How solve this equation
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Polynomial Remainder Question?
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number theory about index
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Divisibility question
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A simple doubt in number theory problem.
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How should I solve combination addition like this?
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Basic number theory proofs
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number theory $\gcd(a,bc)=\gcd(a,c)$
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Pairs of numbers with a given LCM
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Solve for n: $\varphi(2n)=\varphi(3n)$
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Solving a Diophantine equation with a large solution
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Elementary number theory and quadratic
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Project Euler Question 14 (Collatz Problem)
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How to solve the equation $n^2 \equiv 0 \pmod{584}$?