general/arithmetic-dynamics

Type of number introduced by Mike Keith

Number that is more than the sum of its proper divisors

Sum of all proper divisors of a natural number

Numbers whose sum of divisors is twice the number minus 1

Pair of integers related by their divisors

Number whose divisors add to a multiple of that number

Numbers with a certain property involving recursive summation

Mathematical recursive sequence

Number that is its own Gödel number

Concept in number theory

Sequence in number theory

Number that is the sum of the factorials of its digits

Number equal to the product of the sum and product of its digits

Type of natural number

Number that cannot be written as an aliquot sum

Type of positive integer pairs

Munchausen number

Number that is less than the sum of its proper divisors