Similar to 完全トーティエント数

Centered hexagonal number

Centered cube number

Dedekind number

Heptagonal number

Lazy caterer's sequence

Double factorial

Fourth power

Double Mersenne number

Octagonal number

Happy number

Pandigital number

Beatty sequence

Hilbert number

Factorion

Fibonacci number

Fibonacci word

Practical number

Friedman number

Square triangular number

Square number

Heegner number

Perrin number

Bell number

Divisor

Good prime