Binomial sums related to rational approximations to $\zeta(4)$

摘要

For the solution $\{u_n\}_{n=0}^\infty$ to the polynomial recursion$(n+1)^5u_{n+1}-3(2n+1)(3n^2+3n+1)(15n^2+15n+4)u_n -3n^3(3n-1)(3n+1)u_{n-1}=0$,where $n=1,2,...$, with the initial data $u_0=1$, $u_1=12$, we prove that all$u_n$ are integers. The numbers $u_n$, $n=0,1,2,...$, are denominators ofrational approximations to $\zeta(4)$ (see math.NT/0201024). We use Andrews'sgeneralization of Whipple's transformation of a terminating ${}_7F_6(1)$-seriesand the method from math.NT/0311114.