My dog is an intelligent being and he doesn't share our affinity for math. We have to acknowledge that our concept of intelligence is human-centric. What we interpret as knowledge is based on our specific limitations and perceptions. We don't know what intelligence is and won't necessarily know it when we see it.
Let's hope then that aliens coming here will be vegan.
We're not intelligent enough yet not to harm others, or to go to other star systems, or even other galaxies. Would we be considered intelligent, or a source of protein?