The story
Named after French mathematician Roger Apéry who proved in 1978 that it is an irrational number.
Etymology from Wiktionary, CC BY-SA 4.0.
Apéry's constant
Today it means: The number ζ(3)=∑ₙ₌₁ ᪲1/(n³), where ζ is the Riemann zeta function, with a value of approximately 1.2020569… Full definition →