I had always wondered 'How to figure primes' as a child, and I had also wondered again as our children began to learn. I was so glad to read that Wikipedia says this, 'There is no known useful formula that yields all of the prime numbers and no composites.' Once your kids have seen how the first primes are found, the easiest way for them to tell whether a number is prime or not is to be able to reference a chart even if they only write the first 12 to 25 in their books.
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