A056647 a(n) = A056623(A001405(n)).

1, 1, 1, 1, 1, 4, 1, 1, 9, 36, 1, 4, 4, 1, 9, 9, 1, 4, 1, 4, 4, 1, 1, 4, 100, 25, 100, 25, 9, 144, 9, 9, 1, 4, 25, 100, 100, 25, 9, 36, 4, 1, 4, 1, 25, 400, 225, 900, 1764, 441, 196, 49, 49, 784, 4, 1, 1, 16, 1, 16, 16, 4, 441, 441, 49, 196, 49, 196, 36, 9, 1, 4, 4, 1, 100, 25, 1225

Offset

1,6

Comments

Previous name "Largest unitary square divisor of central binomial coefficient" was incorrect. See A376553 for the correct sequence with this name. - Amiram Eldar, Sep 28 2024

Links

Table of n, a(n) for n=1..77.

Formula

a(n) = A008833(A001405(n))/A055229(A001405(n))^2 = A056057(n)/A056059(n)^2.

Example

a(28) = A056623(binomial(28,14)) = A056623(40116600) = 25.

Crossrefs

Cf. A001405, A008833, A055229, A056056, A056057, A056059, A056623, A376553.

Sequence in context: A219207 A157108 A376553 * A056057 A226234 A369189

Adjacent sequences: A056644 A056645 A056646 * A056648 A056649 A056650

Keyword

nonn

Author

Labos Elemer, Aug 09 2000

Extensions

Incorrect name replaced with a formula by Amiram Eldar, Sep 28 2024

Status

approved