素数で脳トレ

This app is a super niche app that is a brain training based on the theme of prime numbers.

There are three difficulty levels, so you can enjoy it as long as you have a minimum knowledge of prime numbers!
(Even the developer himself can't get A rank on the highest difficulty "Demon Difficult"...
We look forward to your challenge! )

■Brain training items
・Prime number or NOT
The number will be displayed, so if it is a prime number, quickly press the "Prime" button, and if it is not, quickly press the "NOT" button.

・Find prime numbers
Only one of the 12 cards with numbers written on it is a prime number, so find it quickly and tap it.

・Tap in order
Prime numbers are written on 20 cards, so please tap them quickly in ascending order of numbers.

・Flash prime number mental arithmetic
The numbers will be displayed in the same way as flash mental arithmetic, so please add only the prime numbers.
Example) If 7,4,5,2,9 is displayed,
The answer is 7+5+2=14.

・Location memory
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.

■List of prime numbers
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.