You head toward the lake.
When you reach the lake, you notice that the area would be perfect for setting up the first parts of your camp. You test the water, and it is drinkable. The site provides a water source, a flat area for homes, protection from weather on one side with the rock formation.
You have to send a signal to the other expeditions that you’ve found a colony site.
Your service manual says the radio frequency should be the sum of the first 3 prime numbers (if you're counting from 1 up as in 1, 2, 3, and so on). What is the radio frequency?