The digital root (also repeated digital sum) of a number is the number obtained by adding all the digits, then adding the digits of that number, and keep on summing until a single-digit number is reached.
For example, the digital root of 73946 is 7, because 7 + 3 + 9 + 4 + 6 = 29 and 2 + 9 = 11 and 1 +1 =2....CONTD...
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