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.

A267710 Number of unit triangular lattice cells enclosed by origin centered circle of diameter n.

Original entry on oeis.org

0, 6, 6, 24, 24, 54, 60, 96, 114, 150, 180, 216, 258, 324, 348, 426, 450, 540, 564, 666, 720, 804, 870, 954, 1056, 1134, 1230, 1344, 1416, 1542, 1614, 1752, 1842, 1974, 2100, 2208, 2346, 2478, 2628, 2778, 2898, 3084, 3180, 3378, 3474, 3684, 3822, 4002, 4176, 4356
Offset: 1

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Author

Luca Petrone, Jan 19 2016

Keywords

Comments

As n -> infinity, lim a(n)/(n^2) -> Pi/sqrt(3).

Crossrefs

Cf. A093602 (Pi/sqrt(3)).