About PiNumpad. Tau

PiNumpad is a free memory trainer for tau (6.28318530717958...), tau, equal to 2π, the ratio of a circle's circumference to its radius. 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.

Tau simplifies many formulas involving circles and radians, a full turn is τ radians, not 2π. It has a dedicated following among mathematicians who argue it is the more natural circle constant. 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 maths students, engineers, programmers, and advocates of the tau manifesto who prefer their circle constants in terms of radius rather than diameter. 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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