# Sequence 2,7,8,1,7,4,2,8,4,8,2,1,5,4,7,5,7,7,5,8,

• January 20th 2011, 11:16 AM
misterobsessed
Sequence 2,7,8,1,7,4,2,8,4,8,2,1,5,4,7,5,7,7,5,8,

2,7,8,1,7,4,2,8,4,8,2,1,5,4,7,5,7,7,5,8,

there are two more numbers to the sequence but I just have not been able to get them Please help

John
• January 20th 2011, 11:33 AM
FernandoRevilla
Quote:

Originally Posted by misterobsessed

2,7,8,1,7,4,2,8,4,8,2,1,5,4,7,5,7,7,5,8,

there are two more numbers to the sequence but I just have not been able to get them Please help

There are twenty numbers: $a_1,\ldots,a_{20}$ in your sequence. If I have understood correctly your question, you want to find $a_{21}$ and $a_{22}$ finding a determined rule. Well, in that case the correct answer is $a_{21}=\alpha$ and $a_{22}=\beta$ being $\alpha$ and $\beta$ chosen at random. And all of his as a consequence of a well known result about the Lagrange interpolation polynomial.

Fernando Revilla
• January 21st 2011, 12:51 AM
Opalg
Quote:

Originally Posted by misterobsessed

2,7,8,1,7,4,2,8,4,8,2,1,5,4,7,5,7,7,5,8,

there are two more numbers to the sequence but I just have not been able to get them Please help

John

I can see why you think that a math help forum might be the place for this problem, but I suspect that the answer may not involve mathematics at all. If I had to guess, I would suspect that these numbers might perhaps be the lengths of the words in some saying, poem, song, something like that?

Where did this sequence come from, and how do you know that there are only two more elements in it? If you can give us something of the background to the problem, it might give some clues about what the sequence represents.
• January 22nd 2011, 09:26 AM
Wilmer
The sequence sure looks like the digits of e plus a few from pi thrown in!!

Could even be forming 3 words, like from telephone: 2 = a,b,c 3 = d,e,f ... (1 = blank: separating words)
• January 27th 2011, 07:46 AM
Chris11
Quote:

Originally Posted by misterobsessed

2,7,8,1,7,4,2,8,4,8,2,1,5,4,7,5,7,7,5,8,

there are two more numbers to the sequence but I just have not been able to get them Please help

John

Sorry, but why would you work on this for over a year?
• March 28th 2011, 10:26 AM
Inigo
It seems to me that this is a brute force random permutation...is this a snippet of code from a video game or audio program on shuffle?
• April 23rd 2011, 12:56 PM
proofhoe95
Well, it's very obviously not a function, so the previous posts noting that this isn't exactly a mathematical problem are very correct. I would tend to agree that it is probably a numerical transcription of some text.
• April 23rd 2011, 01:37 PM
topsquark
I wouldn't worry about it as the OP never made a response. Obviously it wasn't that important to him/her.

-Dan
• April 23rd 2011, 08:03 PM
CaptainBlack
When I see such a sequence the first thing I do if the general form is not obvious is search the Online Encyclopedia of Integer Sequences, and lo - it knows this sequence not.

(this is probably a neopets puzzle)

CB