Digital root number is the number mod 11 (Ɛ), for example, 1972 is 1 + 9 + 7 + 2 = 19 = 17 which is 1 + 7 = 8, while in decimal the root of the same number (3110) is 5; and in base 16 a digital root of a number is the number mod 15 (0xF), for example, 0x7DF is 7 + 13 + 15 = 35 = 0x23 which is 2 + 3 = 5, while in decimal the root of the same number (2015) is 8. Digital roots form an important mechanic in the visual novel adventure
Multiplicative digital root of 9876 is 0 and its multiplicative persistence (the number of steps required to reach a single digit) is 2. Multiplicative digital root The multiplicative digital root of a positive integer "n" is found by multiplying the digits of "n" together, then repeating this operation until only a single digit remains. This single-digit number is called the multiplicative digital root of "n". Multiplicative digital roots depend upon the base in which "n" is written. If the term is used without qualification, it is assumed that "n" is written in base 10. Multiplicative digital roots are the multiplicative equivalent of digital