Similar to リクレル数

Fibonacci word

Fermat number

Fortunate number

Weird number

Deficient number

Twin prime

Practical number

Blum integer

Friedman number

Brocard's problem

Proth number

Partition function (number theory)

Square-free integer

Square triangular number

Square number

Heegner number

Perrin number

Bell number

Pell number

Bernoulli number

Markov number

Mian–Chowla sequence

Mersenne number

Motzkin number

Divisor

Amicable numbers