Strange restriction

In this post the question is posed how to model the restriction
$$x \in \{1,2,3,4,5,6,8,10,12,..,100\}.$$
Note that this is $\{1,2,3,4,5\} \cup \{6,8,10,..,98,100\}$.  Never seen a thing like this, but here is a way to model this in a MIP model:
$$\begin{align}     & 6 - (1-\delta)M \le x \le  5 + \delta M\\     & 2y -(1-\delta)M \le x \le 2y+(1-\delta)M \\     & 1 \le x \le 100 \\     & x \> \text{integer}\\     & y \> \text{integer}\\     & \delta \> \text{binary} \end{align}$$
Note that this essentially means:
$$\begin{align}   & \delta=0 \implies x\le 5 \\   & \delta=1 \implies x\ge 6, x = 2y \end{align}$$
We can use $M=100$ (or even refine that a little bit).