Add 13 more and post it forever.

Tigeree · 2010-05-09 22:14:48

shoe?

5213

bobbym · 2010-05-09 22:24:53

5226 13^2 + 31^2 + 64^2

Yes a shoe.

phrontister · 2010-05-09 23:59:22

5239

FIVE - TWO + THREE - NINE = 5239

Each letter in the puzzle stands for a different digit from 0 to 9. Find the letter values.

ZHero · 2010-05-10 00:06:39

Hi phrontister!
sorry i just couldn't resist myself from posting 5239 again!

Last edited by ZHero (2010-05-10 06:47:57)

bobbym · 2010-05-10 05:12:51

phrontister wrote:

FIVE - TWO + THREE - NINE = 5239
Each letter in the puzzle stands for a different digit from 0 to 9. Find the letter values.

Now for the next number, a small 4 x 4 magic square that totals to 5252:

phrontister · 2010-05-11 03:38:45

ZHero wrote:

Hi phrontister!
sorry i just couldn't resist myself from posting 5239 again!

No probs...it is good for my mind to be broadened.

But you didn't post a new number!

Some more primes with that number 5239: 2, 3, 5, 23, 29, 53, 523.

Also,
52 = 4 x 13
52 - 39 = 13
52 + 39 = 7 x 13
5 + 2 - 3 + 9 = 13
5 + 2 + 3 + √9 = 13

Hi Bobby,

Correct! The solution is unique.

5265 (catchup):

-52 + 65 = 13
5 + INV2 * 6 + 5 = 13

5278

-52 + 78 = 26 = 13 + 13
52 + 78 = 130
The product of the outer two digits - the inner two digits (27) = 13

Last edited by phrontister (2010-05-11 03:56:05)

bobbym · 2010-05-11 03:49:38

5291

ZHero · 2010-05-11 03:59:19

phrontister wrote:

But you didn't post a new number!

5304

5317

Last edited by ZHero (2010-05-11 04:04:48)

bobbym · 2010-05-11 04:19:33

5330

phrontister · 2010-05-11 04:57:11

bobbym · 2010-05-11 05:00:32

5343

The string 5,3,4,3 appears at:

ZHero · 2010-05-12 04:02:57

5356 = (1 + 3) × (10 + 3) × (100 + 3)

5356 is the 103[sup]rd[/sup] Triangular number!

535 + 6 is a Prime number.

53 + 56 is a Prime number.

5 + 3 × 56 is a Prime number.

53 + 5 × 6 is a Prime number.

5 × 35 + 6 is a Prime number.

53 × 5 + 6 is a Prime number.

5 + 3 + 5 + 6 is a Prime number.

5 × 3 × 5 - 6 = 69

bobbym · 2010-05-12 06:36:55

5369

ZHero · 2010-05-12 21:43:21

5382 = (13 + 5 × 0) × (13 + 5 × 1) × (13 + 5 × 2)

5 × 3 + 82 is a Prime number.

5 + 3 × 8 + 2 is a Prime number.

5 × 3 + 8 × 2 is a Prime number.

F[sub]5[/sub] × F[sub]3[/sub] × F[sub]8[/sub] + F[sub]2[/sub] is a Prime number.

F[sub]5[/sub] × F[sub]3[/sub] + F[sub]8[/sub] × F[sub]2[/sub] is a Prime number.

F[sub]5[/sub] + F[sub]3[/sub] × F[sub]8[/sub] × F[sub]2[/sub] is a Prime number.

F[sub]5[/sub] + F[sub]3[/sub] + F[sub]8[/sub] + F[sub]2[/sub] is a Prime number.

F[sub]5 × 3[/sub] + F[sub]3 × 2[/sub] is a Prime number.

(5 + 3) × 8 + 2 = 66

Last edited by ZHero (2010-05-12 21:53:43)

Tigeree · 2010-05-13 19:24:52

5395

Nice colours, btw.

bobbym · 2010-05-13 20:36:53

5408.

A 6 X 6 magic square with some negative numbers thrown in for good luck. Completely done by hand. Everything sums to 5408.

phrontister · 2010-05-13 22:29:14

bobbym wrote:

Completely done by hand. Everything sums to 5408.

How on earth can you do something like that by hand? Or by anything else, for that matter??

Last edited by phrontister (2010-05-13 22:45:24)

bobbym · 2010-05-13 22:35:02

5434:

You just need fast hands. Here is a 7 x 7.

phrontister · 2010-05-13 22:51:53

bobbym wrote:

You just need fast hands.

You mean fast fingers on the ends of your hands?

bobbym · 2010-05-13 23:02:01

5460:

Fast fingers help. You also need fast eyeballs to check em.

phrontister · 2010-05-13 23:16:19

No good me trying to learn how, then.

bobbym · 2010-05-13 23:30:09

5486

phrontister wrote:

No good me trying to learn how, then.

Hi phrontister;

I will show you what I have discovered but may I ask that it isn't done right now. I would like to enjoy being the only only one who can do it for a little while. Is that OK with you?

The real reason:

Oh, and I forgot. The method is not really ready for public use. It is ugly, long and mathematica intensive. It is in pieces and not even fully automated. Even the original math is ugly and not terribly imaginative. Actually I am kind ashamed of it.

phrontister · 2010-05-14 00:55:10

If it's mathematica-intensive, it's goodnight me. If it's ugly and something to be ashamed of, then it's goodnight it.

I suspected Mathematica was at the bottom of this...you must have had a bit of fun setting it up to the stage it's at!

5499

(5!/4)/√9+√9 = 13

Last edited by phrontister (2010-05-14 00:56:07)

bobbym · 2010-05-14 01:02:26

5512:

The string 5512 appears at:

Hi phrontister;

Don't get me wrong it was not a built in function. I had to figure it all out and then program it. It took an entire week. It still requires a lot of work out of me. I hope to be able to automate the process soon.

phrontister · 2010-05-14 02:34:45

No...I didn't think it was a built-in function you were using. That is why I thought you'd been having fun trying to get the thing to work.

Math Is Fun Forum

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Re: Add 13 more and post it forever.

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