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=3*6-((3*1)+(1*2))=13 different vertices and S=(3*6)-(3*1)=15 different sides. The N=V+S=13+15=28 first strictly positive integer numbers {1,2,3,...,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 02/26/2018 12:17:43 -CET-)

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