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:<math>f(x) = \pi_0(x) + \frac{1}{2}\,\pi_0(x^{1/2}) + \frac{1}{3}\,\pi_0(x^{1/3}) + \cdots</math>
in which a prime power {{math|''p''<sup>''n''</sup>}} counts as {{frac|1|{{mvar|n}}}} of a prime. The normalized [[prime-counting function]] can be recovered from this function by
:<ref>{{Cite journal |last=Li |first=Xian-Jin |date=April 2004 |title=Explicit formulas for Dirichlet and Hecke $L$-functions |url=https://projecteuclid.org/journals/illinois-journal-of-mathematics/volume-48/issue-2/Explicit-formulas-for-Dirichlet-and-Hecke-L-functions/10.1215/ijm/1258138394.full |journal=Illinois Journal of Mathematics |volume=48 |issue=2 |pages=491–503 |doi=10.1215/ijm/1258138394 |issn=0019-2082|doi-access=free }}</ref><math>\pi_0(x) = \sum_n\frac{1}{n}\,\mu(n)\,f(x^{1/n}) = f(x) - \frac{1}{2}\,f(x^{1/2}) - \frac{1}{3}\,f(x^{1/3}) - \frac{1}{5}\,f(x^{1/5}) + \frac{1}{6}\,f(x^{1/6}) - \cdots,</math>
where {{math|''μ''(''n'')}} is the [[Möbius function]]. Riemann's formula is then
:<math>f(x) = \operatorname{li}(x) - \sum_\rho \operatorname{li}(x^\rho) - \log(2) + \int_x^\infty \frac{dt}{~t\,(t^2-1)~\log(t)~}</math>
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