Taxi-cab numbers, among the most beloved integers in math, trace their origins to 1918 and what seemed like a casual insight by the Indian genius Srinivasa Ramanujan. Now mathematicians have discovered that Ramanujan did not just identify the first taxi-cab number -- 1729 -- and its quirky properties. He showed how the number relates to elliptic curves and K3 surfaces -- objects important today in string theory and quantum physics.
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