Test your knowledge of taxicab geometry, triangular numbers, the golden ratio and more. Credit... Supported by By Steven Strogatz “Math, Revealed,” our four-part series exploring the mathematics ...

The first four triangular numbers are 1, 3, 6 and 10, and the nth triangular number is given by the expression n(n+1)/2, so the 20th such number is 20 × 21 ÷ 2 = 210. ENIGMA is a triangular ...

https://doi.org/10.4169/college.math.j.46.3.172 https://www.jstor.org/stable/10.4169/college.math.j.46.3.172 The College Mathematics Journal emphasizes the first two ...

https://doi.org/10.4169/college.math.j.43.1.037 https://www.jstor.org/stable/10.4169/college.math.j.43.1.037 Summary Latin squares form the basis for the recreational ...

At first glance, the 153 looks really meaningless. Yet, it has amazing mathematical properties. Moreover, it was not only explicitly mentioned in the Bible and, for various reasons, brings a smile to ...

The eccentric privateer Sir Francis Duck disliked being interrupted while playing bowls, but the situation was urgent. "Cap'n Duck?" said the ship's mate nervously, tapping him on the shoulder. "What ...