Behera and Panda [1] proved that the square of any balancing number is a triangular number. It is also true that if r is a balancer, then r + r2 is a triangular number. Subramaniam [14, 15] explored many interesting properties of square triangular numbers without linking them to balancing numbers because of their unavailability in the literature at that time. In [16] he introduced the concept of almost square triangular numbers (triangular 1numbers that differ from a square by unity) and linked them with the square triangular numbers. Panda and Ray [11] introduced cobalancing numbers as
solutions of the Diophantine equation 1+2+…+ n = (n+1) + (n+2) +…+ (n+r) calling r∈ℤ+ the cobalancer corresponding to n. The cobalancing numbers are linked to a third category of triangular numbers that are expressible as the product of two consecutive natural numbers (approximately as the arithmetic mean of squares of two consecutive natural numbers i.e.