Because 15 is the product of distinct Fermat primes, 3 and 5, a regular polygon with 15 sides is constructible with compass and unmarked straightedge, and cos π / 15 is expressible in terms of square roots (see here).. If a positive definite quadratic form with integer matrix represents all positive integers up to 15, then it represents all positive integers via the 15 and 290 theorems.15 Years of Wiggly Fun!/Gallery < 15 Years of Wiggly Fun! Edit. History Talk (0) Comments Share. This page is an image gallery for 15 Years of Wiggly Fun!. Please add to the contents of this page, but only images that pertain to the article. Gallery. The Wiggles 15th birthday cake. The Wiggly Group.
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