Problem 421

Prime factors of n15+1

Numbers of the form `n`^{15}+1 are composite for every integer `n` 1.

For positive integers `n` and `m` let `s`(`n,m`) be defined as the sum of the *distinct* prime factors of `n`^{15}+1 not exceeding `m`.

So

Also 10

So

Find ∑ `s`(`n`,10^{8}) for 1 `n` 10^{11}.

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