h.c.p. (hexagonal close packing), sequences related to (start):
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 (start):
Hadamard matrices, mass of: A048615 */A048616 *
Hadamard matrices, number of: A007299 *, A036297 *
Hadamard matrices, see also: A004118
Hadamard maximal determinant problem: A003432 *, A003433 , A036297 , A051753
half-totient function: A023022
Halving:: A003155 , A006577
Hamilton numbers: A000905 *, A002090 , A006719
Hamiltonian graphs, paths, cycles, polyhedra, etc.: see graphs, Hamiltonian
Hamiltonian paths and cycles on the n-cube: see Gray codes
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 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 database
hcf (highest common factor) is written as gcd (greatest common divisor) in the database
HCF: the canonical spelling in the database is GCD (nor HCF or gcd) for "greatest common divisor"
hcf: the canonical spelling in the database is GCD (nor hcf or gcd) for "greatest common divisor"
hcp: see h.c.p