Similar to 婚約数

Centered tetrahedral number

Centered polygonal number

Centered heptagonal number

Centered octagonal number

Centered octahedral number

Centered hexagonal number

Centered cube number

Dedekind number

Heptagonal number

Lazy caterer's sequence

Binomial coefficient

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