#### Challenge "Number Sequence" ¶

By: admin on May 19, 2010, 10:05 a.m.

This sequence is infinite, but you may recognize it after just 13 numbers. What is the 14th number?Please type in the numeric expression of the number.

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By: admin on May 19, 2010, 10:05 a.m.

This sequence is infinite, but you may recognize it after just 13 numbers. What is the 14th number?Please type in the numeric expression of the number.

Read more...

Last edited by: admin on Oct. 31, 2021, 2:54 a.m., edited 1 time in total.

By: Adam on Oct. 17, 2010, 12:48 p.m.

Is there some place in this forum where we can discuss how we arrived at the answer? I got the number right, but I'm not sure if the pattern I saw is the same pattern the original creator had in mind. I'll just leave it at that so I don't spoil anything.

By: be on Oct. 17, 2010, 1:07 p.m.

Hello Adam,

Is there some place in this forum where we can discuss

how we arrived at the answer?

Yes, that's possible and its welcome too.

You can either use the contact formular; or send an email directly to the author of a challenge. If the author allowed us to publish his email you get it in the following way:

In the list of challenges there is on the right side of the title of each challenge an information icon.

If you click on it you see the author's email address.

(e.g. in the list on page http://www.mysterytwisterc3.com/index.p ... vel-i.html)

By: HermannSW on Oct. 20, 2010, 10:16 p.m.

As far as I know you could choose any number you like.

You always find a sequence that fits. [HTML_REMOVED]

Even tough it is not the idea in this level 1 challenge …

Correct, and I found immediately two well documented different sequence continuations …

I will send an email to the author so that later he can provide that information – as you said the idea is to find "a" continuation making sense …

By: Jarhead1801 on April 13, 2012, 5:30 a.m.

I have always enjoyed riddles. This is my first time on this site and as a blue collar guy with only a high school education. I find my notes for solving this "riddle" interesting. What do you all think and how can I improve my solving speed?

here are my notes:

Q: 1 - 2 - 4 - 6 - 10 - 12 - 16 - 18 - 22 - 28 - 30 - 36 - 40 - ?

A: xxx

1+1=2 2+2=4 4+4≠6

n + (n x .5)= nope

1 2 2 4 2 4 2 4 6 4 6 4 48? (incorrect 14 tries left)

Is this the point that the pattern repeats itself 41? (incorrect 13 tries left)

Do not google it…. I never did have much self control but I know -213 isnt the answer.

f(n) = n*n + 1 (now how do I decipher this math equation)

1 1 0 2 -2 2 -2 2 2 -2 2 -2 xxx? (CORRECT \o/)

By: be on April 13, 2012, 4:37 p.m.

Here are my notes:

Q: 1 - 2 - 4 - 6 - 10 - 12 - 16 - 18 - 22 - 28 - 30 - 36 - 40 - ?

It's ok to discuss approaches how to solve a challenge but don't tell the solution (so I changed it to xxx). You assumed a number to be the solution: Was this a guess or did you google it? If you need to discuss telling the solution please send a private email from the forum to the MTC3 team or the author of a challenge.

So far there is no formula known to this sequence. Its based on a very special kind of numbers. If you get the idea, it's easy.

The sequence is infinite and without cycles. The next few elements after the ? are: - 46 - 52 - 58 - 60 -

Maybe you noticed that all numbers beside the first one are even.

By: tux77 on Feb. 9, 2015, 8:45 p.m.

Hi,

Im very begginer in maths and more on cryptanalyse probleme i had no degree im not bachelor but i like using my mind and i want to try solve easy problem.

'Sequence number 1' is hard for me but i think a i have an idea but i have a problem im my thinking.

I think its the sequence number of the first primal number -1 but i'm not sure.

Why there is the "2" number who is primal no? or its the reduction of (primal number 3)-1? and the one is the 'primal number 2)-1?

Its a good reasoning ?

Thank for answer and sorry for my bad english.

Great from Paris,

Tux

By: be on Feb. 23, 2015, 9:59 a.m.

Its a good reasoning ?

Thank for answer and sorry for my bad english.

Great from Paris,

Hello tux77,

Your reasoning is correct.

Maybe, you already revealed too much of the solution :-) However, it's a thin line between meaningful discussions in the forum and uncovering a bit too much.

Don't worry about your English, we could understand it. Maybe, you could use a spell checker in the future before sending.

If you already solved this challenge in the meantime you may add this information to your forum post.

Kind regards back to Paris.

By: puttputt86 on Sept. 20, 2022, 6:13 p.m.

This is a prime example of an excellent sequence puzzle. For a while I felt I was always just one step behind, but eventually I got there :D

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