 Another champion for that title might be

Both formulas were derived by Bernhard Riemann in his seminal 1859 paper ""Über die Anzahl der Primzahlen unter einer gegebenen Größe"" ("On the Number of Prime Numbers less than a Given Quantity"), one of the milestones in the development of analytic number theory—the branch of mathematics that studies prime numbers using the tools of mathematical analysis.Factorial numbers, considered as discrete objects, are an important concept in classical number theory because they contain many prime factors, but Riemann found a use for their continuous extension that arguably turned out to be even more important.The gamma function has caught the interest of some of the most prominent mathematicians of all time.