This number is a prime.

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John Pilkins ©2003
+ The Escher compound that appears in the "Waterfall" lithograph by M. C. Escher divides the three component cubes into 67 individual cells. [Post]

+ Smallest odd prime number of bicentered 3-valent (or boron, or binary) trees with n nodes. Here with n = 12. [Post]

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