Primes

1 2 3 4 5 6

7 8 9 10 11 12

13 14 15 16 17 18

I would like to bring something up that I discovered in 5th grade. All primes other than 2 and 3 can be expressed as 6n + 1 or 6n - 1. I think I know why, but I would like to see some other ideas...

My Ideas

• 6n, 6n + 2, 6n - 2 are all even.
• 6n + 3 is a multiple of 3.
• 6n + 1 and 6n - 1 are the only remaining possibilities.

3 years ago

MarkdownAppears as
*italics* or _italics_ italics
**bold** or __bold__ bold
- bulleted- list
• bulleted
• list
1. numbered2. list
1. numbered
2. list
Note: you must add a full line of space before and after lists for them to show up correctly
paragraph 1paragraph 2

paragraph 1

paragraph 2

[example link](https://brilliant.org)example link
> This is a quote
This is a quote
    # I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
# I indented these lines
# 4 spaces, and now they show
# up as a code block.

print "hello world"
MathAppears as
Remember to wrap math in $$...$$ or $...$ to ensure proper formatting.
2 \times 3 $$2 \times 3$$
2^{34} $$2^{34}$$
a_{i-1} $$a_{i-1}$$
\frac{2}{3} $$\frac{2}{3}$$
\sqrt{2} $$\sqrt{2}$$
\sum_{i=1}^3 $$\sum_{i=1}^3$$
\sin \theta $$\sin \theta$$
\boxed{123} $$\boxed{123}$$

Sort by:

This is very true

- 3 years ago

But can it be proved in another way?

- 3 years ago