Basic elementary number theory
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Best introductory text on elementary number theory that is concise
41412
Inequality in number theory
84879
Solving infinite sums with primes.
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Prime factorization knowing n and Euler's function
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A binary irrational with bits defined by primes
34588
Number Theory: $p!+p=n^2$, $p$ = prime
19446
Number theory question from today's Pre - RMO
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Foundational proof for Mersenne primes
97866
Undergraduate/High-School-Olympiad Level Introductory Number Theory Books For Self-Learning
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Elementary proof for $\sqrt{p_{n+1}} \notin \mathbb{Q}(\sqrt{p_1}, \sqrt{p_2}, \ldots, \sqrt{p_n})$ where $p_i$ are different prime numbers.
136947
Simple Mersenne prime divisibility proofs
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Prime dividing the binomial coefficients
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Integers and integer functions
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Fermat's little theorem's proof for a negative integer
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elementary proof that infinite primes quadratic residue modulo $p$
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Number Theory: Complete set of residues modulo $n$
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Number theory: $x^y + 1 = y^x$