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What (who) is heptagonal$34762$ - definition
POLYGONAL NUMBER
Heptagonal numbers; Generalized heptagonal number
Heptagonal number
A heptagonal number is a figurate number that is constructed by combining heptagons with ascending size. The n-th heptagonal number is given by the formula
Heptagonal tiling
![The symmetry group of the heptagonal tiling has fundamental domain the (2,3,7) [[Schwarz triangle]], which yields this tiling.](https://commons.wikimedia.org/wiki/Special:FilePath/3-7 kisrhombille.svg?width=200 "The symmetry group of the heptagonal tiling has fundamental domain the (2,3,7) [[Schwarz triangle]], which yields this tiling.")
TILING OF THE HYPERBOLIC PLANE
Order-3 heptagonal tiling
In geometry, a heptagonal tiling is a regular tiling of the hyperbolic plane. It is represented by Schläfli symbol of {7,3}, having three regular heptagons around each vertex.
Truncated heptagonal tiling
Truncated order-3 heptagonal tiling; Order-3 truncated heptagonal tiling
In geometry, the truncated heptagonal tiling is a semiregular tiling of the hyperbolic plane. There are one triangle and two tetradecagons on each vertex.
Wikipedia
Heptagonal number
A heptagonal number is a figurate number that is constructed by combining heptagons with ascending size. The n-th heptagonal number is given by the formula
- .
The first few heptagonal numbers are:
- 0, 1, 7, 18, 34, 55, 81, 112, 148, 189, 235, 286, 342, 403, 469, 540, 616, 697, 783, 874, 970, 1071, 1177, 1288, 1404, 1525, 1651, 1782, … (sequence A000566 in the OEIS)
