Three hexagons and the twenty-eight first strictly positive integer numbers -nine of them being prime numbers- [Trois hexagones et les vingt-huit premiers nombres entiers strictement positifs -neuf d'entre-eux étant des nombres premiers-].




A structure (white dotted lines) is built using three contiguous hexagons. This structure has:
                    V = 3x3 + 3 + 1 = 13 different vertices (9 single vertices, 3 double vertices and 1 triple vertice)
and:
                    S = 3x4 + 3 = 15 different sides (12 single sides and 3 double sides).
The N=V+S=13+15=28 first strictly positive integer numbers {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28} are located on this structure with the following constraints: The colored lines (starting with 1 -red, at the center of the structure- and ending with 28 -yellow, in the middle right-) display the natural order of the integer numbers.


[See the C program used to solve the problem]


(CMAP28 WWW site: this page was created on 02/28/2013 and last updated on 02/19/2024 18:51:33 -CET-)



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