Similar to 友愛数

Centered nonagonal number

Centered pentagonal number

Centered triangular number

Centered square number

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