# Questions Tagged with "elementary number theory"

Explore solved questions tagged with "elementary number theory" or help others by answering their unsolved questions related to "elementary number theory".

## Positive integer solutions to $frac{1}{a} + frac{1}{b} = frac{c}{d}$

Mathematics Asked 8 months ago

## Proving Euler’s Totient Theorem

Mathematics Asked 8 months ago

## Sum $sum_{(k_1, k_2, k_3): k_1+k_2+k_3=K, ,, n_1+n_2+n_3=N}k_1^{n_1}times k_2^{n_2} times k_3^{n_3}$

Mathematics Asked 8 months ago

## Find all integer values of $a$ such that $a^2 - 4a$ is a perfect square

Mathematics Asked 8 months ago by hardik-ddod

## When is $sum_{i=1}^{m}i^n =0 bmod dfrac{m(m+1)}{2}$?

Mathematics Asked 8 months ago

## One number is removed from the set of integers from $1$ to $n.$ The average of the remaining numbers is $163/4.$ Which integer was removed?

Mathematics Asked 8 months ago by Drich1002

## Establishing divisibility by a prime

Mathematics Asked 8 months ago

## Chinese Remainder Theorem for moduli that are not necessarily pairwise coprime

Mathematics Asked 9 months ago

## Solve $x^2+3y = u^2$ and $y^2+3x=v^2$ in positive integers.

Mathematics Asked 9 months ago by The Demonix _ Hermit