Similar to 四つ子素数

Self number

Automorphic number

Natural number

Seventh power

Decagonal number

Sociable number

Dodecagonal number

Power of 10

Schnirelmann density

Cyclic number

Sylvester's sequence

Strobogrammatic number

Smith number

Refactorable number

Taxicab number

Powerful number

Singly and doubly even

Centered nonagonal number

Centered pentagonal number

Centered triangular number

Centered square number

Centered tetrahedral number

Centered polygonal number

Centered heptagonal number

Centered octagonal number