Factor Lock Builder

Grid size

Lock number

Design: enter whole numbers from 2 to 999. A factor string is available when its numbers can be traced through touching cells — horizontally, vertically or diagonally — without using a cell twice.

Cells may contain decoy numbers. Factor strings are counted once even when the same numbers appear in more than one place or can be traced in reverse.

Enter a composite lock number, then design the grid.

Prime factorisation

2⁵ × 3 × 5

Mathematical factor strings

multi-number strings

Factor strings available in this grid

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Calculating…

The grid count reports unique factor strings, not every physical route. Click an available factor string below to show one example swipe.

Available factor strings

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