Thread: Club 27
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Old 18-11-2011, 12:09 AM   #56
lightgiver
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Lightbulb 27

Twenty-seven is a perfect cube, being 33 = 3 × 3 × 3. 27 is also 23 (see tetration). There are exactly 27 straight lines on a smooth cubic surface, which give a basis of the fundamental representation of the E6 Lie algebra. 27 is also a decagonal number.

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