Memorise Primes with muscle memory

MemorisePi is a free tool for memorising prime numbers (ℙ = 2, 3, 5, 7, 11, …). Each prime is its own numpad sequence. Instead of recalling the number, you recall a gesture. Trained through repetition, the same way your fingers learn a PIN or a chord. Enable sound from the menu to also build melody memory: each digit plays a unique musical tone.

It works on any device, but performs best on a phone. With enough repetition, the primes become a sequence of movements rather than numbers.

Study. Browse all primes with their numpad paths pre-drawn.

Learn. The prime digits are shown. Tap them in order and watch the path reveal itself.

Play. No digits shown. Tap from memory alone. Hold hint to see the path.