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# Index to OEIS: Section X

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# Index to OEIS: Section X

- This is a section of the Index to the
**OEIS®**. - For further information see the main
**Index to OEIS**page. - Please read Index: Instructions For Updating Index to OEIS before making changes to this page.
- If you did not find what you were looking for in this Index, you can always search the database for a particular word or phrase.
- Full list of sections:

[
Aa |
Ab |
Al |
Am |
Ap |
Ar |
Ba |
Be |
Bi |
Bl |
Bo |
Br |
Ca |
Ce |
Ch |
Cl |
Coa |
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U |
V |
Wa |
We |
Wi |
**X** |
Y |
Z |
1 |
2 |
3 |
4
]

x in S implies 2x not in S: A050292

x*ceiling(x), iterating (1): A073524, A073528, A073529, A068119, A001511, A072340, A073341, A075102, A075103, A075120, A075107, A075108

x*ceiling(x), iterating (2): A023506

x*floor(x), iterating: A087666, A086336, A087663

x/(1-rx-sx^2): see Fibonacci numbers, generalized

XOR(x,y): A003987*

XOR, bitwise: A048724, A178729, A048725, A178731, A178732, A178733, A178734, A178735, A178736, A038712, A048726, A065621, A003987, A169810, A070883

XOR, see also (1): A003815 A003816 A006582 A007462 A033460 A038554 A038712 A038713 A048706 A048833 A050314

XOR, see also (2): A050600 A050601 A050602 A051124 A051933 A054243

x^2+xy+y^2, of form: A003136*

** x^2+y^2 <= n, sequences related to : **

x^2+y^2+2z^2, of form: A000401*, A055039, A014455 (number of representations)

x^4+y^4+z^4 = t^t: A003828*

x^x, derivative of: A005727*, A005168*

- This is a section of the Index to the
**OEIS®**. - For further information see the main
**Index to OEIS**page. - Please read Index: Instructions For Updating Index to OEIS before making changes to this page.
- If you did not find what you were looking for in this Index, you can always search the database for a particular word or phrase.
- Full list of sections:

[
Aa |
Ab |
Al |
Am |
Ap |
Ar |
Ba |
Be |
Bi |
Bl |
Bo |
Br |
Ca |
Ce |
Ch |
Cl |
Coa |
Coi |
Com |
Con |
Cor |
Cu |
Cy |
Da |
De |
Di |
Do |
Ea |
Ed |
El |
Eu |
Fa |
Fe |
Fi |
Fo |
Fu |
Ga |
Ge |
Go |
Gra |
Gre |
Ha |
He |
Ho |
Ia |
In |
J |
K |
La |
Lc |
Li |
Lo |
Lu |
M |
Mag |
Map |
Mat |
Me |
Mo |
Mu |
N |
Na |
Ne |
Ni |
No |
Nu |
O |
Pac |
Par |
Pas |
Pea |
Per |
Ph |
Poi |
Pol |
Pos |
Pow |
Pra |
Pri |
Pro |
Ps |
Qua |
Que |
Ra |
Rea |
Rel |
Res |
Ro |
Ru |
Sa |
Se |
Si |
Sk |
So |
Sp |
Sq |
St |
Su |
Sw |
Ta |
Te |
Th |
To |
Tra |
Tri |
Tu |
U |
V |
Wa |
We |
Wi |
**X** |
Y |
Z |
1 |
2 |
3 |
4
]