Equilateral Triangles in 3D with Integer Coordinates

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The number of equilateral triangles with integer coordinates in a cube of size depends on the "minimal" equilateral triangles defined in such a cube and all the transformations of such triangles. This Demonstration shows the minimal triangles along with the total number of equilateral triangles for = 1 to 5.

Contributed by: Rodrigo A. Obando (October 2007)
After work by: Eugen Ionascu
Open content licensed under CC BY-NC-SA


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Details

For more information, see:

E. J. Ionascu, "A Parametrization of Equilateral Triangles Having Integer Coordinates," Journal of Integer Sequences, 10(6), 2007 Article 07.6.7, www.cs.uwaterloo.ca/journals/JIS.

E. J. Ionascu, "Counting All Equilateral Triangles in {0, 1, ..., n}^3," math.colstate.edu/ejionascu. (Oct 18, 2007)

"Number of Equilateral Triangles with Coordinates (x, y, z) in the Set {0, 1, ..., n}," (sequence A102698), in The On-Line Encyclopedia of Integer Sequences (copyright N. J. A. Sloane), www.research.att.com/~njas/sequences. (Oct 18, 2007)



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