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# Index to OEIS: Section Ha

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# Index to OEIS: Section Ha

- 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
]

** h.c.p. (hexagonal close packing), sequences related to : **

- h.c.p., coordination sequence: A007899
- h.c.p., crystal ball sequence: A007202
- h.c.p., numbers represented by: A005870
- h.c.p., theta series of: A004012*, A005871, A005872, A005873, A005874, A005888, A005889, A005890
- h.c.p.: see also A019298

** Hadamard matrices , etc., sequences related to : **

- Hadamard matrices, equivalence classes of: A007299, A036297 (equivalence classes under row/column permutation and negation); A096201 (equivalence classes under row/column permutation and negation, and transposition)
- Hadamard matrices, equivalent to transpose: A206704, A206705 (equivalence classes which contain the transpose)
- Hadamard matrices, excess of: A004118
- Hadamard matrices, largest automorphism group: A206707
- Hadamard matrices, mass of: A048615*/A048616*
- Hadamard matrices, number of: A007299*, A036297*, total number: A206711, A206712 (all Hadamard matrices regardless of equivalence)
- Hadamard matrices, orders of: A019442
- Hadamard matrices, regular: see A016742
- Hadamard matrices, 2-designs: A001111 (2-(4*n-1,2*n-1,n-1) symmetric designs)
- Hadamard matrices, 3-designs: A048885 (3-(4*n,2*n,n-1) designs, aka OA(4*n,4*n-1,2,2))
- Hadamard maximal determinant problem: A003432*, A003433, A036297, A051753
- Hadamard maximal determinant problem: see also determinants, maximal

half-totient function: A023022

Halving:: A003155, A006577

** Hamilton , sequences related to : **

- Hamilton cycles, paths, graphs: see graphs, Hamiltonian
- Hamilton numbers: A000905*, A002090, A006719
- Hamiltonian cycles: see graphs, Hamiltonian
- Hamiltonian graphs: see graphs, Hamiltonian
- Hamiltonian paths or cycles on the n-cube: see also Gray codes
- Hamiltonian paths: see graphs, Hamiltonian
- Hamiltonian polyhedra: see graphs, Hamiltonian

Hamming sequence: A051037

Hankel function: A002514

Hannah Rollman's numbers: A048992*

Hanoi, see Towers of Hanoi

happy factorizations: A007696, A007697, A007698

happy numbers: A007770*, A038497, A001273

happy numbers: see also A031177, A068571, A046519, A035502, A035503, A055629

Harary and Palmer, **Graphical Enumeration**, **sequences found in**

hard-hexagon model: A007236

** harmonic , sequences related to : **

- harmonic coefficients, triangle of: A027858
- harmonic means: (1) A001599 A001600 A006086 A006087 A007340 A046793 A046794 A046795 A046796 A046797 A053626 A053627
- harmonic means: (2) A053628 A053629 A055081 A056136
- harmonic numbers: A001599*, A001008*/A002805*, A035527
- harmonic numbers: see also A001600, A008380, A035047 A035048 A046024 A051046 A052488 A055573
- harmonic series, odd: A074599/A025547
- harmonic series: A002387*, A004080*
- harmonic series: see also A004796, A004980
- harmonic triangle of Leibniz: A003506*
- harmonic triangle of Leibniz: see also A002457 A007622 A046200 A046201 A046202 A046203 A046204 A046205 A046206 A046207 A046208 A046212

Harshad numbers: A005349*

Harvey Friedman's sequence: see A014221

Hauptmodul series: A007325

Havender tableaux: A007345

HCF (highest common factor) is written as GCD (greatest common divisor) in the OEIS

hcf (highest common factor) is written as GCD (greatest common divisor) in the OEIS

HCF: the canonical spelling in the OEIS is GCD (nor HCF or gcd) for "greatest common divisor"

hcf: the canonical spelling in the OEIS is GCD (nor hcf or gcd) for "greatest common divisor"

hcp: see h.c.p

- 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
]