### 1 Answer

Relevance

- hayharbrLv 71 month ago
k is the largest factor of p other than p itself (since k has to be less than p).

So for 28, the largest factor besides 28 is 14; p = 28 and k = 14; see what 28 + 14 is

For 15, k would be 5, right? so 15 + 5 = 20 = n. The do it again for n = 20 (k would be 10, etc)

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