  We provide an elementary proof to a conjecture by Robinson that multiples of
(powers of) primes in the Somos-4 sequence are equally spaced. We also show,
almost as a corollary, for the generalised Somos-4 sequence defined by
$\tau_{n+2}\tau_{n-2}=\alpha\tau_{n+1}\tau_{n-1}+\beta\tau_n^2$ and initial
values $\tau_1=\tau_2=\tau_3=\tau_4=1$, that the polynomial
$\tau_n(\alpha,\beta)$ is a divisor of $\tau_{n+k(2n-5)}(\alpha,\beta)$ for all
$n,k\in\mathbb Z$ and establish a similar result for the generalized Somos-5
sequence.
