A k-mirror number is a positive integer without leading zeros that reads the same both forward and backward in base-10 as well as in base-k.

- For example, `9` is a 2-mirror number. The representation of `9` in base-10 and base-2 are `9` and `1001` respectively, which read the same both forward and backward.
- On the contrary, `4` is not a 2-mirror number. The representation of `4` in base-2 is `100`, which does not read the same both forward and backward.

Given the base `k` and the number `n`, return the sum of the `n` smallest k-mirror numbers.

Example 1:

    Input: k = 2, n = 5
    Output: 25
    Explanation:
    The 5 smallest 2-mirror numbers and their representations in base-2 are listed as follows:
      base-10    base-2
        1          1
        3          11
        5          101
        7          111
        9          1001
    Their sum = 1 + 3 + 5 + 7 + 9 = 25.

Example 2:

    Input: k = 3, n = 7
    Output: 499
    Explanation:
    The 7 smallest 3-mirror numbers are and their representations in base-3 are listed as follows:
      base-10    base-3
        1          1
        2          2
        4          11
        8          22
        121        11111
        151        12121
        212        21212
    Their sum = 1 + 2 + 4 + 8 + 121 + 151 + 212 = 499.

Example 3:

    Input: k = 7, n = 17
    Output: 20379000
    Explanation: The 17 smallest 7-mirror numbers are:
    1, 2, 3, 4, 5, 6, 8, 121, 171, 242, 292, 16561, 65656, 2137312, 4602064, 6597956, 6958596

Constraints:

- `2 <= k <= 9`
- `1 <= n <= 30`