Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**noelevans****Member**- Registered: 2012-07-20
- Posts: 236

1234567891 and 123456791 easy to remember primes for testing some things in number theory.

Also 31, 331, 3331, 33331, 333331, 3333331, 33333331 are all prime.

Writing "pretty" math (two dimensional) is easier to read and grasp than LaTex (one dimensional).

LaTex is like painting on many strips of paper and then stacking them to see what picture they make.

Offline

**mathgogocart****Member**- Registered: 2012-04-29
- Posts: 1,434

9/bold-11.

Hey.

Offline

**bobbym****Administrator**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 92,260

The fourth repunit prime is huge

And no one knows how many of them there are!

**In mathematics, you don't understand things. You just get used to them.**

**I agree with you regarding the satisfaction and importance of actually computing some numbers. I can't tell you how often I see time and money wasted because someone didn't bother to run the numbers.**

Offline

**mathgogocart****Member**- Registered: 2012-04-29
- Posts: 1,434

Omg.

Hey.

Offline

**mathaholic****Member**- From: idk
- Registered: 2012-11-29
- Posts: 2,905
- Website

13 - The unlucky number

That's why there is a Friday the 13th!

I will have a name change soon. By the way, welcome to the Philippines, Pope Francis!

Offline

3691 the only primenumber I have noticed till now in a car's number plate

'And fun? If maths is fun, then getting a tooth extraction is fun. A viral infection is fun. Rabies shots are fun.'

'God exists because Mathematics is consistent, and the devil exists because we cannot prove it'

'You have made another human being happy. There is no greater accomplishment.' -bobbym

Offline

**mathaholic****Member**- From: idk
- Registered: 2012-11-29
- Posts: 2,905
- Website

7 - the luckiest number

That's why there's Lucky seven.

I will have a name change soon. By the way, welcome to the Philippines, Pope Francis!

Offline

**mathaholic****Member**- From: idk
- Registered: 2012-11-29
- Posts: 2,905
- Website

2^57,885,161-1

I will have a name change soon. By the way, welcome to the Philippines, Pope Francis!

Offline