List questions from gcd-and-lcm

Published on 18 Dec 2016 - 11:49

178

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If $a(n)=n^2+1$ then $\gcd(a_n,2^{d(a_n)})=1\text{ or }2$?

Published on 25 Mar 2026 - 17:40

160

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Prove: if $d=\text{gcd}(m,n)$ so $\text{gcd}\left(\frac{m}{d},\frac{n}{d}\right)=1$

Published on 19 Dec 2016 - 19:37

138

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The $n^{th}$ digits of $e+\pi$ and a periodic sequence

Published on 26 Mar 2026 - 11:00

1.4k

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GCD of binomial coefficients

Published on 21 Dec 2016 - 13:24

292

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The least common multiple of $n-2$ and $n+2$

Published on 16 Mar 2026 - 10:31

148

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Proof: Combining coprime numbers

Published on 22 Dec 2016 - 14:45

365

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Find all pairs of positive integers that add up to $667$ and their $\frac{\text{lcm}}{\text{gcd}} =120$

Published on 15 Mar 2026 - 19:58

347

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$a,b,m,n$ be positive integers such that g.c.d.$(a,b)=1$ and $a^m+b^m\mid a^n+b^n$ , then $m\mid n$?

Published on 28 Dec 2016 - 11:46

682

Views

A GCD summation $\sum_{\gcd(i,n)=1} \gcd(i-1,n)$

Published on 26 Mar 2026 - 23:09

177

Views

Form of odd primes with totients co-prime to $5$?

Published on 26 Mar 2026 - 19:19

1.7k

Views

Finding a number that is relative prime to given number

Published on 28 Mar 2026 - 6:09

477

Views

Without a calculator, find gcd(20!+95, 19!+5).

Published on 06 Jan 2017 - 0:46

164

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I need some help with a GCD and LCM's Problem

Published on 15 Mar 2026 - 18:04

163

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Find the $\gcd[x+y+z; x^2+xy+z^2; y^2+yz+z^2; z^2+zx+x^2]$

Published on 08 Jan 2017 - 6:54

List Question

GCD with prime factorisation demonstration

If $a(n)=n^2+1$ then $\gcd(a_n,2^{d(a_n)})=1\text{ or }2$?

Prove: if $d=\text{gcd}(m,n)$ so $\text{gcd}\left(\frac{m}{d},\frac{n}{d}\right)=1$

The $n^{th}$ digits of $e+\pi$ and a periodic sequence

GCD of binomial coefficients

The least common multiple of $n-2$ and $n+2$

Proof: Combining coprime numbers

Find all pairs of positive integers that add up to $667$ and their $\frac{\text{lcm}}{\text{gcd}} =120$

$a,b,m,n$ be positive integers such that g.c.d.$(a,b)=1$ and $a^m+b^m\mid a^n+b^n$ , then $m\mid n$?

A GCD summation $\sum_{\gcd(i,n)=1} \gcd(i-1,n)$

Form of odd primes with totients co-prime to $5$?

Finding a number that is relative prime to given number

Without a calculator, find gcd(20!+95, 19!+5).

I need some help with a GCD and LCM's Problem

Find the $\gcd[x+y+z; x^2+xy+z^2; y^2+yz+z^2; z^2+zx+x^2]$

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