👉 Apery is a mathematical concept in number theory that deals with the properties of numbers that are invariant under certain transformations. It is named after the mathematician Joseph Apery, who first introduced it in 1930s. The term "apery" is often used to describe the behavior or structure of numbers that can be uniquely represented as a finite sum of powers of primes. This concept has applications in number theory and cryptography, where it is used to analyze the security properties of cryptographic systems