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We obtain in exact arithmetic the order 24 linear differential operator$L_{24}$ and right hand side $E^{(5)}$ of the inhomogeneousequation$L_{24}(\Phi^{(5)}) = E^{(5)}$, where $\Phi^{(5)}=\tilde{\chi}^{(5)}-\tilde{\chi}^{(3)}/2+\tilde{\chi}^{(1)}/120$ is a linearcombination of $n$-particle contributions to the susceptibility of the squarelattice Ising model. In Bostan, et al. (J. Phys. A: Math. Theor. {\bf 42},275209 (2009)) the operator $L_{24}$ (modulo a prime) was shown to factorizeinto $L_{12}^{(\rm left)} \cdot L_{12}^{(\rm right)}$; here we prove that nofurther factorization of the order 12 operator $L_{12}^{(\rm left)}$ ispossible. We use the exact ODE to obtain the behaviour of $\tilde{\chi}^{(5)}$at the ferromagnetic critical point and to obtain a limited number of analyticcontinuations of $\tilde{\chi}^{(5)}$ beyond the principal disk defined by itshigh temperature series. Contrary to a speculation in Boukraa, et al (J. Phys.A: Math. Theor. {\bf 41} 455202 (2008)), we find that $\tilde{\chi}^{(5)}$ issingular at $w=1/2$ on an infinite number of branches.

Square lattice Ising model $\tilde{\chi}^{(5)}$ ODE in exact arithmetic