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Published at 713 × 373 in Let’s build a prime detector!
Box with red outline and white background. Words in red at the top reading Whole number detector and just below and to the right it also reads in red version 2.1. Then in black it gives a mathematical expression which reads floor function of (2) to the (x - floor x). Underneath that in red is written outputs. If the output is 1 then x is whole. If the output is 0 then x is not whole.

Elinor is a PhD student at the Open University studying the history of maths. She loves maths, history and most things in between!
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