A, B, C and D are triangular numbers.

A, B and C are always consecutive while D is their sum.

Determine (and explain as best as possible¹) how such sets of values are distributed across the number system.

^1. This can be explained in terms of a single variable expression.

1+3+6=10

got it by solving a single equation

Posted by Ady TZIDON on 2009-11-29 16:20:14