The multiplicative digital root (MDR) and multiplicative persistence (MP) of a number, n, is calculated rather like the Digital root except digits are

Continue Reading## C++: Root Mean Square

Compute the Root mean square of the numbers 1..10. The root mean square is also known by its initial RMS (or rms), and as the quadratic mean. Th

Continue Reading## C++: Digital Root

The digital root, X, of a number, n, is calculated: find X as the sum of the digits of n find a new X by summing the digits of X, repeating un

Continue Reading