Greatest common divisor 2
190
Why $\gcd(qb+r,b)=\gcd(b,r)$?
52546
How can I find the possible values that $\gcd(a+b,a^2+b^2)$ can take, if $\gcd(a,b)=1$
105832
prove that if $\gcd(a,b)=1$ then $\gcd(a^2, b^2)=1$
53327
$C_2 \times C_2$ and $C_4$
27859
least common multiple of $\{1,2,...,n\}$ is bigger than $2^{n-1}$
140087
The number of divisors
15348
prime divisor of $3n+2$ proof
107095
Prove $\gcd(a,b) \gcd(a,c) \gcd(b,c) \,\text{lcm} (a,b,c)^2=$ $\text{lcm}(a,b)\,\text{lcm}(a,c) \,\text{lcm}(b,c) \gcd(a,b,c)^2$
119793
Proving that $D_{12}\cong S_3 \times C_2$
152506
The greatest common divisor is the smallest positive linear combination
93930
GCD of the already GCD
101872
Prove that $\gcd(a^2, b^2) = \gcd(a, b)^2$
116970
On the number divisors of a number
76507
$\gcd(b^x - 1, b^y - 1, b^ z- 1,\dots) = b^{\gcd(x, y, z,\dots)} -1$
94914
Concise proof that every common divisor divides GCD without Bezout's identity?
65687
$\gcd(a,b)\gcd(x,y)\mid ax+by$
128199
Proving gcd(a, a+2) is 1 or 2 for every integer a?