---
tag: 0RQSNVTFVZ
kind: concept
name: Prime-counting function
msc: [11N05]
sources:
  - url: https://en.wikipedia.org/wiki/Prime-counting_function
    locator: lead section
same_as:
  wikidata: Q251922
  wikipedia: Prime-counting function
---

## Summary

The prime-counting function $\pi(x)$ gives the number of primes that are less than or equal to a real number $x$.
The [[definition of the prime-counting function|0XRJB5SSNE]] gives the precise form.