Test your knowledge of taxicab geometry, triangular numbers, the golden ratio and more.

Learn about how triangle sequences, quadratic sequences and the common difference with this BBC Bitesize Maths article. For students between the ages of 11 and 14.

TRYGVE BREITEIG, Quotients of triangular numbers, The Mathematical Gazette, Vol. 99, No. 545 (July 2015), pp. 243-255 ...

In this paper, we prove that there are infinitely many triangular numbers which have two different ways to be decomposed as the product of two triangular numbers, each greater than 1 ...

Not deducible 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 ...