Similar to 婚約数

Cake number

Lucky number

Pentagonal pyramidal number

Pentagonal number

Fifth power (algebra)

Pentatope number

Tetrahedral number

Triangular number

Sierpiński number

Square pyramidal number

Self-descriptive number

Self number

Decagonal number

Dodecagonal number

Power of 10

Cyclic number

Strobogrammatic number

Prime power

Refactorable number

Singly and doubly even

Centered nonagonal number

Centered pentagonal number

Centered triangular number

Centered square number