See also: Four Fours, Five Fives
Six Sixes
Write each integer as a combination of 6 6's. Any mathematical symbol is allowed except for digits that are not 6.
Six Sixes/Table of 6s
Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle 6 = 6 + \dfrac{6 + 6}{6 + 6} - \cos{\left(6 \pi\right)} }