13th root 13th root Extracting the 13th root of a number is a famous category for the mental calculation world records. The challenge consists of being given a large number (possibly over 100 digits) and asked to return the number that, when taken to the 13th power, equals the given number. For example, the 13th root of 8,192 is 2 and the 13th root of 96,889,010,407 is 7. Extracting the 13th root has certain properties. One is that the 13th root of a number is much smaller: a 13th root will have approximately 1/13th the number of digits. Thus, the 13th root
Triangular number 4 years would lose of its "losable" value in the first year, in the second, in the third, and in the fourth, accumulating a total depreciation of (the whole) of the losable value. By analogy with the square root of , one can define the (positive) triangular root of as the number such that : which follows immediately from the quadratic formula. So an integer is triangular if and only if is a square. Equivalently, if the positive triangular root of is an integer, then is the th triangular number. Triangular number A triangular number or triangle number counts objects