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erdos_1084.variants.easy_upper_d2

Specification

It is easy to check that $f_2(n) < 3n$.

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Lean 4 Statement 
theorem erdos_1084.variants.easy_upper_d2 (hn : n ≠ 0) : f 2 n < 3 * n
ID: ErdosProblems__1084__erdos_1084.variants.easy_upper_d2
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