Triplet numbers are sets of three numbers that share a specific mathematical relationship. One common example is the Pythagorean triplet, where the numbers satisfy the equation a^2 + b^2 = c^2. In this case, a, b, and c are the lengths of the sides of a right triangle, with c being the hypotenuse. A well-known Pythagorean triplet is 3, 4, 5. Another type of triplet number is the n, n+1, n+2 sequence, where the numbers are consecutive integers. This simple pattern can be found in various mathematical contexts, such as in combinatorics and number theory. Triplet numbers can also appear in other forms, like 1, 2, 3, which are often used in basic counting and arithmetic exercises.