On the divisibility of the truncated hypergeometric function F23

Suppose that p is an odd prime and α,β are prime to p. We prove that p2 divides the truncated hypergeometric functionF23[αβ1−α−β11|1]p provided 〈α〉p+〈β〉p≤p, where 〈α〉p denotes the least non-negative residue of α modulo p.