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Around 300 B.C.E., the Greek mathematician and logician Euclid proved that there are infinitely many prime numbers. Euclid began by assuming that there is a finite number of primes.

Around 300 B.C.E., the Greek mathematician and logician Euclid proved that there are infinitely many prime numbers. Euclid began by assuming that there is a finite number of primes.

But in 1536, mathematician Hudalricus Regius noticed that 11 is prime but not (211 - 1), which equals 2047. The number 2047 can be expressed as 11 times 89, disproving the conjecture.