More than 2,000 years ago, Euclid of Alexandria (325–265 B.C.) provided a simple proof that the sequence of prime numbers continues forever. A prime is a whole number (other than 1) that’s evenly divisible only by itself and 1. This definition leads to the following sequence of numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, and so on.
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