WDiophantine equation
WCannonball problem
WCoin problem
WCongruum
WDiophantus II.VIII
WEquation xʸ = yˣ
WErdős–Diophantine graph
WFermat's right triangle theorem
WLonely runner conjecture
WMarkov number
WMordell curve
WOptic equation
WPell's equation
WPythagorean quadruple
WPythagorean triple
WSums of three cubes
WTree of primitive Pythagorean triples