---
tag: 0YAG43TCXQ
kind: concept
name: Mersenne number
msc: [11A41]
sources:
  - url: https://en.wikipedia.org/wiki/Mersenne_prime
    locator: lead section
---

## Summary

A Mersenne number is an integer of the form $2^n - 1$, one less than a power of two.
The [[definition of a Mersenne number|0GJBJ19NXR]] gives the precise form.