The spin one-point function in the critical Ising chain has a natural boundary of analyticity on the negative real axis after Borel resummation, with singularities matching those of an odd-divisor sum series.
Nickel, Journal of Physics A: Mathematical and General32, 3889 (1999)
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Analyticity, asymptotics and natural boundary for a one-point function of the finite-volume critical Ising chain
The spin one-point function in the critical Ising chain has a natural boundary of analyticity on the negative real axis after Borel resummation, with singularities matching those of an odd-divisor sum series.