# Mersenne Primes — Study the biggest prime number

> App displays digits of known Mersenne prime numbers, showing generation process. (iPhone/iPad app by 华 魏.)

- Source: https://appshunter.io/ios/app/mersenne-primes/id1362004527 (this page in markdown: same URL + `.md`)
- Developer: [华 魏](https://appshunter.io/developer/454719266)
- Category: Books, Reference
- Price: Free with in-app purchases
- Rating: 5.00/5 from 1 App Store ratings · 4 written reviews indexed
- Age rating: 4+
- Requires: iOS 9.0 · 60 MB
- Languages: American English
- Released: 2018-03-26
- Data updated: 2026-08-19
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/mersenne-primes/id1362004527/reviews.md

## What is Mersenne Primes?

Prime numbers are fundamentally important in mathematics and they are also very beautiful numbers.
The largest known prime number we know now is 2^77232917-1 and it is a Mersenne Prime (a prime number of the form Mn = 2^n − 1 for some integer n which is also a prime number).
The current largest Mersenne Prime number M77232917 (found in 2017 by GIMPS - Great Internet Mersenne Prime Search) has 23,249,425 digits. There is no website that can show you all the digits in a webpage because it is too huge.
This app will generate and show you all digits of all known Mersenne Primes. You can also have close look of every digit page by page.
The digits will be generated by your mobile phone's CPU and saved to your storage card. You will witness the whole process of the generation for the big ones (i.e. M77232917 , M74207281, M57885161, M43112609, M42643801, M37156667, ...), because it might need one day or two to print the digits all.
You can also locate a digit by its sequence number. e.g. the 23249268th digit of M77232917 is 8.

## Key features

- View all digits of known Mersenne Primes
- Witness prime number generation process
- Page-by-page digit exploration
- Locate specific digits by sequence number
- Generates primes using mobile CPU

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| One Support | $0.99 | one-time |


## Recent user reviews (4 of 4)

All indexed reviews: https://appshunter.io/ios/app/mersenne-primes/id1362004527/reviews.md

### 5/5 — 我当了一回数学家！

*2021-03-01*

z

### 5/5 — 这个应用可以用来做手机cpu测试哈

*2018-04-01*

我的iphonex算最大的那个77232917显示只需要11小时，有更快的没？

### 5/5 — 很不错的小众应用

*2018-03-31*

梅森素数真的没多少应用在做。听说之前日本人把M77232917印出来还卖断货了。

### 5/5 — This is just what I need

*2018-03-26*

Good app

## Frequently asked questions about Mersenne Primes

### What are Mersenne Primes?

Mersenne Primes are prime numbers of the form 2^n - 1, where n is also a prime number. The app allows you to study these fascinating mathematical entities.

### How does Mersenne Primes generate prime numbers?

The app utilizes your mobile phone's CPU to generate the digits of large Mersenne Primes. This process can take a significant amount of time for the biggest known primes.

### Can I view all the digits of the largest known Mersenne Prime?

Yes, the app can generate and display all digits of known Mersenne Primes, including the current largest, M77232917, which has over 23 million digits.

### How can I find a specific digit within a large prime number?

You can locate any digit by its sequence number. For example, you can find the 23,249,268th digit of M77232917.

### Is Mersenne Primes available on Android and iOS?

Based on the supported devices, Mersenne Primes is available for iPhone and iPad, indicating compatibility with iOS devices.

### How often is Mersenne Primes updated?

The app was last updated on August 21, 2019, with version 0.28. Future updates may introduce new features or prime discoveries.

### What is the age rating for Mersenne Primes?

Mersenne Primes has an age rating of 4+, making it suitable for a wide range of users interested in mathematics.

### Does Mersenne Primes have ads?

No, Mersenne Primes does not contain advertisements. It is a free app with optional in-app purchases.

## Version history (last 5 releases)

### 0.28 — 2019-08-21

1. add calculation progress in main catalog
2. add IAP
3. remove ads

### 0.19 — 2018-04-12

1. Hide home button bar on iPhoneX
2. UI adjustment
3. Hide ad bar for a longer time if user click on it

### 0.16 — 2018-03-31

1. Resource optimization
2. Data file format changing
3. Add a button to show book info
4. Add a restart function

### 0.15 — 2018-03-29

1. Show the info panel about a digit when you tap it.
2. In the panel above, you can locate a digit by its sequence number now. e.g. the 23249268th digit of M77232917 is 8.

### 0.13 — 2018-03-25

No release notes.

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All apps by 华 魏: https://appshunter.io/developer/454719266

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-19.*