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Published at 714 × 373 in Let’s build a prime detector!
Box with blue outline and white background. Words in blue at the top reading Whole number detector and just below and to the right it also reads in blue version 1.0. Then in black it gives a mathematical expression which reads (x - floor x). Underneath that in blue is written outputs. If the output is 0 then x is whole. If the output is some 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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