For any primitive pythagorean triple $(a,b,c)$ either $a$ or $b$ must be a multiple of $3$
16176
Primitive Pythagorean triple divisible by 3
23097
Prove that every number ending in a $3$ has a multiple which consists only of ones.
93948
Is my proof correct? $p_1p_2p_3\cdots p_n+1)$ cannot be the square of an integer
23830
Proof that if $p\equiv3\,\left(\mbox{mod 4}\right)$ then $p$ can't be written as a sum of two squares
101708
Integers can be expressed as $a^3+b^3+c^3-3abc$
7500
$\arctan$ of a square root as a rational multiple of $\pi$
80058
Three variable, third degree Diophantine equation
37529
If $\sqrt[3]{a} + \sqrt[3]{b}$ is rational then prove $\sqrt[3]{a}$ and $\sqrt[3]{b}$ are rational
15003
Pythagorean Quadruples:
40565
How can I prove that one of $n$, $n+2$, and $n+4$ must be divisible by three, for any $n\in\mathbb{N}$
4240
The proof of Triple Vector Products
147403
Formulas for calculating pythagorean triples
2208
$\gcd(a,b,c)=\gcd(\gcd(a,b),c)\,$ [GCD Associative Law]
129521
Is $\sqrt[3]{5}$ in $\mathbb Q(\sqrt[3]{2})$?
138548
For what pair of integers $(a,b)$ is $3^a + 7^b$ a perfect square.
155784
If $\gcd(a, b) = 1$ and if $ab = x^2$, prove that $a, b$ must also be perfect squares; where $a,b,x$ are in the set of natural numbers
73907
Condition for 3 complex numbers to represent an equilateral triangle