About PiNumpad. The Square Root Of 2

PiNumpad is a free memory trainer for the square root of 2 (1.41421356237309...), the square root of 2, the first known irrational number. This page lists the complete digit sequence, every digit grouped as it appears in the trainer, for offline reference or verification.

Complete sequence reference. The digits page lists the full sequence available on PiNumpad, every digit or prime in order, grouped and labelled as they appear in the trainer. Use it as a reference when studying offline, or to verify the sequence you are trying to memorise.

The irrationality of √2 was proved by the ancient Greeks, legend has it that the discovery so disturbed the Pythagoreans that they drowned the mathematician who found it. It appears in geometry, signal processing, and the diagonal of any unit square. Read through the sequence, noting the six-digit groupings and their numpad paths. Cross-reference with Study mode to connect each group of digits to its physical gesture.

PiNumpad is designed for geometry students, engineers, computer scientists, and anyone interested in the history of mathematics and irrational numbers. 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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