cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

Showing 1-2 of 2 results.

A238305 Triangle E(n,k), 1<=k<=n, giving the cardinality of optimal ternary covering codes of empty spheres of length n and radius k.

Original entry on oeis.org

2, 3, 3, 6, 4, 5, 14, 6, 5, 8, 27, 12, 6, 7, 12
Offset: 1

Views

Author

Kamiel P.F. Verstraten, Feb 24 2014

Keywords

Comments

The next term is in the range 71-81.
Right diagonal is equal to A086676.

Examples

			Triangle starts:
01: 2
02: 3 3
03: 6 4 5
04: 14 6 5 8
05: 27 12 6 7 12
...
		

Crossrefs

Related to A060439, which has a code consisting of filled spheres instead of empty spheres.
Related to A230014, the triangle giving the cardinality of optimal binary covering codes of empty spheres.
See also A000983.

A380327 Degeneracy of the n-Mycielski graph.

Original entry on oeis.org

0, 1, 2, 3, 5, 8, 12, 18, 29, 44, 68, 107, 169, 262, 412, 657, 1027, 1632, 2572, 4104, 6463, 10294, 16413, 25935
Offset: 1

Views

Author

Eric W. Weisstein, Jan 21 2025

Keywords

Comments

Not the same as A086676; A086676(10) is in the range [99, 104] and so differs from a(12) = 107.

Extensions

a(18)-a(24) from Andrew Howroyd, Jun 11 2025
Showing 1-2 of 2 results.