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

journal article 85.25 Square-Triangular Numbers, Revisited Peter A. Braza and Jingcheng Tong The Mathematical Gazette , pp. 270-273 (4 pages) ...

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 ...