Whether or not 1 is prime is a question of definitions.

While I admit that it makes more sense to me to say that 1 is not a prime, there is certainly not universal agreement on it. In particular (as I discovered when I took some advanced number theory courses) a number of the people who undertook to compute long lists of primes started their lists with 1. After a while you learn not to be too dogmatic about it. (Though I have to say that there is far more agreement that 1 is not prime than there is on, say, whether 0 is a natural number.)

In reply to Re (tilly) 3: Prime Number Finder by tilly
in thread Prime Number Finder by munchie

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