![]() ![]() ![]() The Greeks understood the importance of primes as the building blocks of all positive integers. By inventing his “sieve” to eliminate nonprimes-using a number grid and crossing off multiples of 2, 3, 5, and above-Eratosthenes made prime numbers considerably more accessible.Įach prime number has exactly 2 factors: 1 and the number itself. Such numbers, divisible only by 1 and themselves, had intrigued mathematicians for centuries. 194 BCE) devised a method for finding prime numbers. In addition to calculating the earth’s circumference and the distances from the earth to the moon and sun, the Greek polymath Eratosthenes (c. ![]() Let’s try an ancient way to find the prime numbers between 1 and 100. A positive integer is a prime number if it is bigger than 1, and its only divisors are itself and 1. Each positive integer has at least two divisors, one and itself. ![]()
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