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Smallest Good Base

Given an integer n represented as a string, return the smallest good base of n.

Given an integer n represented as a string, return the smallest good base of n.

We call k >= 2 a good base of n, if all digits of n base k are 1's.

Smallest Good Base diagram

Example 1

Input: n = "13"

Output: "3"

Explanation: 13 base 3 is 111.

Example 2

Input: n = "4681"

Output: "8"

Explanation: 4681 base 8 is 11111.

Example 3

Input: n = "1000000000000000000"

Output: "999999999999999999"

Explanation: 1000000000000000000 base 999999999999999999 is 11.

Constraints

  • n is an integer in the range [3, 1018].
  • n does not contain any leading zeros.

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