Let $G_{0}$ be a simple Lie group and $Q_{0}$ a maximal parabolic subgroup of quasi-Heisenberg type. In this paper we construct conformally invariant systems of differential operators associated to a homogeneous line bundle $\mathcal{L}_{s} \to G_{0}/Q_{0}$. The systems that we construct yield explicit homomorphisms between appropriate generalized Verma modules. We also determine whether or not these homomorphisms are standard.

In this paper, we find all Fibonacci and Lucas numbers written in the form $2^{a}+3^{b}+5^{c}$, in nonnegative integers $a,b,c$, with $\max\{a,b\}\leq c$.

We give some restricted sum formulas for double zeta values whose arguments satisfy certain congruence conditions modulo 2 or 6, and also give an application to identities showed by Ramanujan for sums of products of Bernoulli numbers with a gap of 6.