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# DIFFICULT Numerical Sequences

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1. Okay so I've been staring at these two sequences for a while now and can't get anywhere:

b) 5, 1, 2, 8, 8, 10, 9, 9, 2, 3, .....

First one was solved

I was hoping some genius on TSR could solve it and explain how.
2. (Original post by *Xena*)
Okay so I've been staring at these two sequences for a while now and can't get anywhere:

b) 5, 1, 2, 8, 8, 10, 9, 9, 2, 3, .....

First one was solved

I was hoping some genius on TSR could solve it and explain how.
I'm gonna tag Zacken so he can move this to maths and possibly be of some assistance
3. (Original post by KaylaB)
I'm gonna tag Zacken so he can move this to maths and possibly be of some assistance
Ah, unfortunately I can't move it from this forum - not in my powers, it's not in study help. Sorry!

Spoiler:
Show
Loving the new picture.
4. (Original post by *Xena*)
Okay so I've been staring at these two sequences for a while now and can't get anywhere:

b) 5, 1, 2, 8, 8, 10, 9, 9, 2, 3, .....

First one was solved

I was hoping some genius on TSR could solve it and explain how.

Had to align it like that for it to fit. As to how? Look up Lagrange Interpolation.
5. (Original post by Zacken)

Had to align it like that for it to fit. As to how? Look up Lagrange Interpolation.
6. (Original post by Zacken)

Had to align it like that for it to fit. As to how? Look up Lagrange Interpolation.
Did you do the algebra yourself? I typed it into Excel to find the differences, realised it was a 9th degree polynomial and decided to pretend I'd never seen the thread,
7. (Original post by 16Characters....)
Did you do the algebra yourself? I typed it into Excel to find the differences, realised it was a 9th degree polynomial and decided to pretend I'd never seen the thread,
Nah, just googled "Online Lagrange interpolate" and copy-pasted the TeX.
8. (Original post by Zacken)
Nah, just googled "Online Lagrange interpolate" and copy-pasted the TeX.
Ah, bless the internet.
9. (Original post by Zacken)
Ah, unfortunately I can't move it from this forum - not in my powers, it's not in study help. Sorry!
10. (Original post by aymanzayedmannan)
11. (Original post by Zacken)

Had to align it like that for it to fit. As to how? Look up Lagrange Interpolation.
How the **** is an A level student meant to get THAT?!
12. (Original post by *Xena*)
How the **** is an A level student meant to get THAT?!
I'm an A-Level student, 'innit
13. (Original post by Zacken)
I'm an A-Level student, 'innit
fml I would never have thought of Lagrange polynomials
14. (Original post by *Xena*)
fml I would never have thought of Lagrange polynomials
To be fair, there is some other descriptor of that sequence, but it's a crappy question and you can't define a unique sequence by giving an arbitrary number of terms, which makes me reluctant to even think about it beyond Lagrange.
15. (Original post by Zacken)
To be fair, there is some other descriptor of that sequence, but it's a crappy question and you can't define a unique sequence by giving an arbitrary number of terms, which makes me reluctant to even think about it beyond Lagrange.
So I guess I won't be getting into IBM

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