`H_n = sum_(k=1)^ "n" 1/k`

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This equation computes the harmonic number. The n-th harmonic number is the sum of the reciprocals of the first n natural numbers.

`H_n = sum_(k=1)^n 1/k = 1 + 1/2 + 1/3 + 1/4 + ... + 1/n`