Similar to Prime_k-tuple

Centered square number

Centered tetrahedral number

Centered polygonal number

Centered heptagonal number

Centered octagonal number

Centered octahedral number

Centered hexagonal number

Central binomial coefficient

Centered cube number

Superabundant number

Superperfect number

Harmonic divisor number

Dedekind number

Heptagonal number

Lazy caterer's sequence

Narcissistic number

Binomial coefficient

Double factorial

Fourth power

Double Mersenne number

Nontotient

Harshad number

Multiply perfect number

Hyperperfect number

Octagonal number

Eighth power

Happy number