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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Issue

疑问、子问题和求助。把大问题拆成子 Issue；从任何一个 Issue 都能开出路线。

新建 Issue

Issue 用来放疑问、子问题和求助。