Feng Qi, Qing Zou, Bai-Ni Guo, THE INVERSE OF A TRIANGULAR MATRIX AND SEVERAL IDENTITIES OF THE CATALAN NUMBERS, Applicable Analysis and Discrete Mathematics, Vol. 13, No. 2 (October 2019), pp.

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

But it was triangular numbers that got the ball rolling in the first place. Sign up here for the weekly Science Times newsletter.

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 ...