# Definition:Apéry's Constant/Historical Note

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## Historical Note on Apéry's Constant

**Apéry's constant** was first investigated by Leonhard Paul Euler, who tried but failed to calculate its value.

Its precise value is still unknown.

However, in $1979$ Roger Apéry published a proof that it is irrational.

The statement of this fact is now known as Apéry's Theorem, and the constant itself is known as Apéry's constant.

## Sources

- 1983: François Le Lionnais and Jean Brette:
*Les Nombres Remarquables*... (previous) ... (next): $1,20205 69 \ldots$