There is no number more metal than six hundred and sixty-six. Thirteen does its best, but there’s something intrinsically metal about 666. It might be the repetition, or it might be that Iron Maiden ...

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 ...

Harry and Tom have each found a 4-digit perfect square, a 3-digit perfect cube and a 3-digit triangular number that use 10 different digits, but with no leading zero. A triangular number is one that ...

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 ...

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 ...

There is no number more metal than six hundred and sixty-six. Thirteen does its best, but there’s something intrinsically metal about 666. It might be the repetition, or it might be that Iron Maiden ...