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Offset logarithmic integral
The offset logarithmic integral is a non-elementary function Li(x) very similar to the logarithmic integral function li(x), defined such that:
- Li(x) = li(x) - li(2).
Explicitly, this means
- <math> {\rm Li} (x) = \int_{2}^{x} \frac{dt}{\ln (t)} \; . </math>
It is often used in formulations of the prime number theorem.
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