Similar to オイラーのφ関数

Prime number

Primorial

Algebraic number

Elliptic curve

Coprime integers

Taxicab number

Powerful number

Unitary divisor

Central binomial coefficient

Superperfect number

Chowla–Selberg formula

Harmonic divisor number

Harmonic number

Diophantine approximation

Diophantine equation

Tate–Shafarevich group

Tate twist

Dirichlet series

Dirichlet L-function

Dirichlet's unit theorem

Dedekind zeta function

Dedekind eta function

Roth's theorem

Ducci sequence

Narcissistic number

Fermat's theorem on sums of two squares