  Using the FiNLIE solution of the AdS/CFT Y-system, we compute the anomalous
dimension of the Konishi operator in planar N=4 SYM up to eight loops, i.e. up
to the leading double wrapping order. At this order a non reducible
Euler-Zagier sum, zeta(1,2,8), appears for the first time. We find that at all
orders in perturbation, every spectral-dependent quantity of the Y-system is
expressed through multiple Hurwitz zeta functions, hence we provide a
Mathematica package to manipulate these functions, including the particular
case of Euler-Zagier sums. Furthermore, we conjecture that only Euler-Zagier
sums can appear in the answer for the anomalous dimension at any order in
perturbation theory.
  We also resum the leading transcendentality terms of the anomalous dimension
at all orders, obtaining a simple result in terms of Bessel functions. Finally,
we demonstrate that exact Bethe equations should be related to an absence of
poles condition that becomes especially nontrivial at double wrapping.
