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Probability of coprime integers

Explore the probability that two random integers are coprime, including the fact that it equals 6 divided by pi squared.

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delone

@delone · Oct 20, 2026

The probability of two random integers sharing no common factor is 6/π²

Pick two whole numbers at random. The chance they're coprime is 6/π², about 61%. Pi shows up somewhere with no circles in sight.

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Source: en.wikipedia.orgTrusted · 60/100

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