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Published at 808 × 372 in Let’s build a prime detector!
Box with green outline and white background. Words in green at the top reading Whole number detector and just below and to the right it also reads in green version 1.1. Then in black it gives a mathematical expression which reads a to the (x - floor x). Underneath that in green is written outputs. If the output is 1 then x is whole. If the output is some other number 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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