The Edge of Hexagon
Figure shows the hexagon with all possible positions within the t-hexagon have been considered and three facts become apparent:
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Only “n” and “n+2” may host prime numbers, because all other cells are even or three divisible or both.
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No n or n+2 cell borders the edge of the hexagon, so spirals near the edge continue past and return to the center of the hexagon.
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No escape is possible