# 素数で脳トレ

> This is a brain training app with the theme of prime numbers.

Canonical page: [https://chrome-stats.com/d/io.izutsu.primebrain](https://chrome-stats.com/d/io.izutsu.primebrain)

## Overview

- **ID:** `io.izutsu.primebrain`
- **Platform:** Android
- **Type:** Android app
- **Status:** Available
- **Publisher:** Izutsu
- **Category:** GAME\_EDUCATIONAL
- **Downloads:** 5
- **Version:** 1.0
- **Last updated:** 2024-11-02
- **First published:** 2024-11-02
- **Publisher country:** JP
- **Data as of:** 2026-09-15
- **Store listing:** [Google Play Store](https://play.google.com/store/apps/details?id=io.izutsu.primebrain)
- **Privacy policy:** [https://note.com/izutsu\_quiz/n/n485a7bdfd5ee](https://note.com/izutsu_quiz/n/n485a7bdfd5ee)

## Description

This app is a super niche app that is a brain training based on the theme of prime numbers.<br><br>There are three difficulty levels, so you can enjoy it as long as you have a minimum knowledge of prime numbers!<br>(Even the developer himself can&#39;t get A rank on the highest difficulty &quot;Demon Difficult&quot;...<br>We look forward to your challenge! )<br><br>■Brain training items<br>・Prime number or NOT<br>The number will be displayed, so if it is a prime number, quickly press the &quot;Prime&quot; button, and if it is not, quickly press the &quot;NOT&quot; button.<br><br>・Find prime numbers<br>Only one of the 12 cards with numbers written on it is a prime number, so find it quickly and tap it.<br><br>・Tap in order<br>Prime numbers are written on 20 cards, so please tap them quickly in ascending order of numbers.<br><br>・Flash prime number mental arithmetic<br>The numbers will be displayed in the same way as flash mental arithmetic, so please add only the prime numbers.<br>Example) If 7,4,5,2,9 is displayed,<br>The answer is 7+5+2=14.<br><br>・Location memory<br>After remembering the arrangement of the 16 cards with prime numbers written on them within the time limit, turn over the face-down cards in ascending order of numbers.<br><br>■List of prime numbers<br>In addition to brain training, we have prepared a list of prime numbers up to 4 digits, so you can use it as you like, such as looking at it to memorize it, or just looking at it to clear your mind.

## Rankings

- #2,962,528 — Overall

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Source: [Chrome-Stats](https://chrome-stats.com/d/io.izutsu.primebrain)