  A set $A$ of nonnegative integers is called a $B_h$-set if every solution to
$a_1+\dots+a_h = b_1+\dots+b_h$, where $a_i,b_i \in A$, has
$\{a_1,\dots,a_h\}=\{b_1,\dots,b_h\}$ (as multisets). Let $\gamma_k(h)$ be the
$k$-th positive element of the greedy $B_h$-set. We give a nontrivial lower
bound on $\gamma_5(h)$, and a nontrivial upper bound on $\gamma_k(h)$ for $k\ge
5$. Specifically, $\frac 18 h^4 +\frac12 h^3 \le \gamma_5(h) \le 0.467214
h^4+O(h^3)$, although we conjecture that $\gamma_5(h)=\frac13 h^4 +O(h^3)$. We
show that $\gamma_k(h) \ge \frac{1}{k!} h^{k-1} + O(h^{k-2})$ for $k\ge 1$ and
$\gamma_k(h) \le \alpha_k h^{k-1}+O(h^{k-2})$, where $\alpha_6 := 0.382978$,
$\alpha_7 := 0.269877$, and for $k\ge 7$, $\alpha_{k+1} := \frac{1}{2^k k!}
\sum_{j=0}^{k-1} \binom{k-1}j\binom kj 2^j$. This work begins with a thorough
introduction and concludes with a section of open problems.
