Similar to 二個の平方数の和

Chebyshev function

Central binomial coefficient

Superabundant number

Superperfect number

Chowla–Selberg formula

Harmonic divisor number

Harmonic number

Diophantine approximation

Diophantine equation

Tate–Shafarevich group

Tate twist

Dirichlet series

Dirichlet character

Dirichlet L-function

Dirichlet's unit theorem

Dedekind zeta function

Dedekind eta function

Roth's theorem

Ducci sequence

Narcissistic number

Nesbitt's inequality

Néron model

Field norm

Nontotient

Harshad number

Basel problem

Birch and Swinnerton-Dyer conjecture