App for learning prime numbers.
Good for exercising judging prime numbers.
Both children and adults can enjoy challenging high score.

A number is displayed in a cute display.
You choose whether the number is prime or not.
The faster you select a correct answer, the higher scores you get.
Even if you spend a lot of time, you can get 1 point.
If it is not a prime number, prime factors are displayed.

10 questions are given.
If you get a good score, high scores are recorded.
There is a mode which given questions continuously.

3 levels are available, from 1-10, 1-30, and 1-100 range.
If you get a score over 900 pts., level 4 (range : 1-1000) will be available.

Prime number table (from 1 to 1000) is also available.