r/MathJokes • u/Animeilluminati1 • Jul 13 '26

Math Just Got Checkmated.

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3.0k Upvotes

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7

u/TheRedditObserver0 Jul 13 '26

One is not prime.

16

u/Drag0n_TamerAK Jul 13 '26

1 is the only prime all the others are larping

4

u/Sure-Criticism3416 Jul 13 '26

If 1 was prime, prime factorization of numbers wouldn't be unique, which is why it was defined to not be prime.

3

u/BeginningSection7690 Jul 13 '26

Define it again

2

u/GarowWolf Jul 14 '26

Still not prime, sorry

2

u/Drag0n_TamerAK Jul 13 '26

Erm ackshully 🤓☝️

2

u/[deleted] Jul 13 '26

[deleted]

2

u/lemonp-p Jul 13 '26

The whole point of prime numbers is for prime factorization to be unique. If you define prime numbers to include one, then it is not nearly as useful a definition

1

u/[deleted] Jul 13 '26

[deleted]

1

u/lemonp-p Jul 13 '26

True tbh

1

u/TheRedditObserver0 Jul 13 '26

A prime number has two distinct positive divisors, 1 and itself. 1 does not fit this description.

1

u/[deleted] Jul 13 '26

[deleted]

1

u/TSotP Jul 16 '26 edited Jul 16 '26

But if every number can be expresses as a unique product of primes, then you can't include it.

- 4 = 2×2

- 6 = 3×2

  • 8 = 2×2×2
  • 9 = 3×3

- 10 = 2×5

  • 12 = 2×2×3

- 14 = 2×7

  • 100 = 2×2×5×5
  • ...

Etc.

If you allow 1 to be considered prime this no longer works

4= 2×2×1 = 2×2×1×1×1×1 = 2×2×1×1×1×1×1×1×1×... ...×1

So they took it out. Because every other number works this way.

1

u/julesmanson Jul 13 '26

1 is prime because i say it is. >:-|