3 ms·

Great video, one mistake I spotted: he did include the number 1 among the prime numbers.

• kol 10y ago
  Because 1 is not a prime: "A prime number (or a prime) is a natural number greater than 1 that has no positive divisors other than 1 and itself." https://www.wikiwand.com/en/Prime_number https://www.wikiwand.com/en/Prime_number
  • rtpg 10y ago
    Funner definition is "positive number with exactly two divisors". This reduces the amount of special casing
  • bbcbasic 10y ago
    The reason: "The uniqueness in this theorem requires excluding 1 as a prime because one can include arbitrarily many instances of 1 in any factorization"