## Search found 9 matches

Tue Oct 21, 2014 8:07 am UTC
Forum: Mathematics
Topic: Favorite math jokes
Replies: 1452
Views: 488378

### Re: Favorite math jokes

This is one some friends came up with the other day:

How do you open a closed door?

Complement it.
Fri Aug 23, 2013 9:26 pm UTC
Forum: Mathematics
Topic: S subset N, exists an r in N such that if r in S then S=N
Replies: 14
Views: 3969

### Re: S subset N, exists an r in N such that if r in S then S=

Similarly, in any bar there exists a person such that if they are drinking, then everybody is drinking.
Thu Apr 25, 2013 4:07 am UTC
Forum: Mathematics
Topic: Silly geometry question
Replies: 6
Views: 1594

### Re: Silly geometry question

This is cool, I went about it in a completely different way. Any integer squared is either congruent to 0 or 1 mod 4 so the difference of two integers squared is 0, 1, or 3 mod 4. So B^2 = C^2 - A^2 can not be congruent to 2 mod 4.
Tue Nov 17, 2009 5:39 am UTC
Forum: General
Topic: Is your ZIP code prime?
Replies: 90
Views: 7574

### Re: Is your ZIP code prime?

Sir_Elderberry wrote:74010 is even and divisible by five. One over is 70409 or 70411, both of which are odd.

I believe that what he meant was that his number was both even and one more than a prime, not one more than an even prime, in which case it would have to be 00003. The number 74010 is one over, and it's even.
Sun Aug 23, 2009 5:29 am UTC
Forum: Forum Games
Topic: Count in Prime Palindromes!
Replies: 106
Views: 12922

### Re: Count in Prime Palindromes!

727
Sun Aug 23, 2009 5:22 am UTC
Forum: Forum Games
Topic: Non-Sequitur Showdown.
Replies: 4272
Views: 541398

### Re: Non-Sequitur Showdown.

What is the maximum airspeed velocity of a coconut-laden swallow?
Fri Jul 24, 2009 4:15 am UTC
Forum: Mathematics
Replies: 53
Views: 9576

### Re: Post your interesting/challenging/fun integrals

I am only in ninth grade, but I believe I may be of assistance in this problem. I am not aware of how to make the mathematical symbols with my keyboard, so I will just describe the procedure. I replace (log x) for u, and 1/x becomes du. The resulting integral is then 1/u du, which becomes log u. The...
Wed May 20, 2009 3:27 am UTC
Forum: General
Topic: Who the dickens are you?
Replies: 10922
Views: 2373714

### Re: INTRO THREAD THE THIRD

I have been able to solve the Rubik's cube in approximately 30 seconds. However, it was merely a hobby, and my timer ran out of batteries because I was unable to turn it off myself. Though I would like to claim that I discovered a method for solving the cube, the credit is attributed to this website...
Mon May 18, 2009 5:01 pm UTC
Forum: General
Topic: Who the dickens are you?
Replies: 10922
Views: 2373714

### Re: INTRO THREAD THE THIRD

I'm Foster. I've been lurking aboot the forums for a few months, and I eventually decided to join. Regarding my career, the technical term would be a "nineth grader". However, I excel at math and English, and I greatly enjoy the sophisticated humour of xkcd. I'm also a fan of The Order of ...