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 ...

Have you ever given thought to the number, 105? To some, it is just a number. To others, it may be the number of a highway or road. To a math professor, 105 is a triangular number, a dodecagonal ...