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Confitura 2015

Superdigit

We define superdigit of an integer x using the following rules:

  • If x has only 1 digit, then its superdigit is x.
  • Otherwise, the superdigit of x is equal to the superdigit of the digit-sum of x. Here, digit-sum of a number is defined as the sum of its digits.

For example, super digit of 98741 will be calculated as:

super-digit(98741) = super-digit(9+8+7+4+1)
                  = super-digit(29)
                  = super-digit(2+9)
                  = super-digit(11)
                  = super-digit(1+1)
                  = super-digit(2)
                  = 2.

You can check contest bye-laws here.

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