1 and Prime Numbers - Numberphile
Is 1 a prime number? Apparently not. Dr James Grime explains. More links & stuff in full description below ↓↓↓ James Grime's website is: http://singingbanana.com/ NUMBERPHILE Website:...
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DR JAMES GRIME: We did a video.I'd done it some time ago about Mersenne primes.And offhandedly, just off the cuff, I saidthat 1 wasn't a prime.Now, if I'm honest, we don't say 1 is prime.There's a special reason for that.And we noticed that some people in the comments said,well, I think I've heard of this before, but why is that?Why isn't 1 a prime?So what is a prime number?Let's think of the definition.You probably know the definition.A prime number is a number that can only be divided by 1and itself.So the prime numbers are 2, 3, 5, 7, 11, 13.You know these numbers.So it sounds like 1 should be a prime number, right?It fits the definition of the prime number.You can divide by 1, and you can divide byitse...
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DR JAMES GRIME: We did a video.I'd done it some time ago about Mersenne primes.And offhandedly, just off the cuff, I saidthat 1 wasn't a prime.Now, if I'm honest, we don't say 1 is prime.There's a special reason for that.And we noticed that some people in the comments said,well, I think I've heard of this before, but why is that?Why isn't 1 a prime?So what is a prime number?Let's think of the definition.You probably know the definition.A prime number is a number that can only be divided by 1and itself.So the prime numbers are 2, 3, 5, 7, 11, 13.You know these numbers.So it sounds like 1 should be a prime number, right?It fits the definition of the prime number.You can divide by 1, and you can divide byitse...
