Why does this loop not work?
Are for loops only possible within functions?
Return n, not numbers
What you’re actually doing is looping 30 times.
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Is that the solution?
What is “number in numbers”? Is that 3 (listed) values or 31 values from [0] to [30]?
What is the desired output? Sure this is possible, but must admit my design script is not fantastic so would personally use Python nodes for loops as this 
I simply want to adress each item in a list [100,200,300] with the same operation, such as +100.
Later it should be used to calculate the distance between one point (point1) and each point in a list of points = [point1, point2, point3, …], so the result will be a list of distances.
No need to get imperative here, design script has functionality to iterate over lists this simple in much simplistic manor. Just use the addition function directly.
N+100;
This will add 100 to every input.
If your math was more involved, the same thing applies:
Math.Round(N+100)/12;
The distance to question you had can be quickly set up by using the node to code functionality. Place a Geometry.DistanceTo node, wire it in with your points, select the node, right click the background and choose ‘node to code’ a s you’ll get the right solution for that as well.
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So iteration over lists looks simple in DS.
Thanks.