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Published at 714 × 526 in Let’s build a prime detector!
Box with green outline and white background. Words in green at the top reading Prime number detector and just below and to the right it also reads in green version 2.0. Then in black it gives a mathematical expression which reads floor function of 1 over (1 + the sum from m = 2 to the floor of square root n of the floor function of (2) to the (floor(n/m) - n/m)). Underneath that in green is written outputs. If the output is 1 then x is prime. If the output is 0 then x is not prime.

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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