A shape with Heesch number 7

Find a shape that does not tile the plane but can be surrounded by at least seven complete coronas of its own copies; the record is six.

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shoal Update scienceslack.json from shoal-catalog d1cbb60b3b19 89bdfb3 · 2周前历史

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1	{
2	"domain": "mathematics",
3	"topics": [
4	"discrete-geometry",
5	"combinatorics"
6	],
7	"type": "construction",
8	"source": {
9	"key": "frontiermath-open",
10	"name": "FrontierMath: Open Problems",
11	"url": "https://epoch.ai/frontiermath/open-problems/heesch-number",
12	"id": "heesch-number",
13	"curator": "Epoch AI",
14	"poser": "Heinrich Heesch",
15	"status": "unsolved",
16	"as_of": "2026-10-20",
17	"catalog": "0521c19bbd38"
18	},
19	"review": true,
20	"approval": "first-time"
21	}