About PiNumpad. Prime Numbers

PiNumpad is a free memory trainer for prime numbers (2, 3, 5, 7, 11, 13, 17, 19...). A prime is an integer greater than 1 divisible only by 1 and itself. This page explains how prime numbers is implemented in the trainer, grouping logic, colour coding, and anything specific to this constant.

About this constant on PiNumpad. The About page explains how this particular constant is implemented in PiNumpad: how the digits are grouped, what the colour coding means, and any notes specific to this constant that differ from the others.

Primes are the atoms of arithmetic. They underpin modern cryptography (RSA encryption, Diffie-Hellman key exchange), appear in physics and biology, and have fascinated mathematicians since antiquity. The sequence is infinite, and its distribution remains deeply mysterious. Check this page if you are new to PiNumpad and want to understand the grouping logic before you start, or if you are switching from another constant and want to understand the differences.

PiNumpad is designed for cryptography students, competitive memorisers, maths olympiad participants, programmers, and anyone who wants to know the first hundred primes by heart. It runs entirely in the browser with no account, no installation, and no cost. Progress is saved locally using your browser's storage.

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