List questions from elementary-number-theory

Published on 11 Apr 2026 - 2:40

186

Views

Legendre symbol question without Euler's Criterion

Published on 16 Apr 2026 - 12:27

241

Views

The smallest number with given number of divisors

Published on 12 Apr 2026 - 17:37

317

Views

A subset of positive integers closed under addition with gcd =1 must have all but a finite number of the non negative integers

Published on 15 Apr 2026 - 9:55

789

Views

Non-pythagorean triples

Published on 11 Apr 2026 - 2:12

168

Views

Calculating the check digit of an ISBN-10 code

Published on 16 Apr 2026 - 12:16

47

Views

Does there exist a natural number $N = xy$ satisfying $D(x)D(y) = 2s(x)s(y)$ with $\gcd(x,y)=1$?

Published on 16 Apr 2026 - 4:08

48

Views

Does there exist an odd natural number $N = xy$ satisfying $D(x)D(y) = 2s(x)s(y)$?

Published on 15 Apr 2026 - 9:49

672

Views

200 different natural numbers to split in sum and products

Published on 11 Apr 2026 - 16:54

1k

Views

For how many primes $p$ is $p^2 + 2$ is also prime?

Published on 16 Apr 2026 - 7:47

171

Views

How can I do the Euclidian's algorithm and the Extended Euclidean algorithm at the same time?

Published on 17 Apr 2026 - 13:24

209

Views

Apply Cardano's method to find the roots of $f(x)=x^3 - 6x + 4$

Published on 14 Apr 2026 - 9:22

47

Views

Why do even exponents occur more often if the residue is $5$ mod $7$?

Published on 15 Apr 2026 - 16:48

263

Views

Prove that $\sqrt{\frac{n}{n+1}}\notin \mathbb{Q}$

Published on 16 Apr 2026 - 12:04

114

Views

Smallest $x+y$ for integer equation $n = 5x + 3y$ in closed form

Published on 17 Apr 2026 - 7:57

List Question

Euler totient function equation: $\varphi(n)=42$

Legendre symbol question without Euler's Criterion

The smallest number with given number of divisors

A subset of positive integers closed under addition with gcd =1 must have all but a finite number of the non negative integers

Non-pythagorean triples

Calculating the check digit of an ISBN-10 code

Does there exist a natural number $N = xy$ satisfying $D(x)D(y) = 2s(x)s(y)$ with $\gcd(x,y)=1$?

Does there exist an odd natural number $N = xy$ satisfying $D(x)D(y) = 2s(x)s(y)$?

200 different natural numbers to split in sum and products

For how many primes $p$ is $p^2 + 2$ is also prime?

How can I do the Euclidian's algorithm and the Extended Euclidean algorithm at the same time?

Apply Cardano's method to find the roots of $f(x)=x^3 - 6x + 4$

Why do even exponents occur more often if the residue is $5$ mod $7$?

Prove that $\sqrt{\frac{n}{n+1}}\notin \mathbb{Q}$

Smallest $x+y$ for integer equation $n = 5x + 3y$ in closed form

Trending Questions

Popular # Hahtags

Popular Questions