This is more like a thinking problem than solving problem.

Yes, you right. I didn't find anything when I searched for something similar.

I removed JS.

Yes, it's 46, my mistake.

95% of time of this kata was to understand what you want. I passed the example tests but didn't what's wrong with random tests.
After I figure it out, I solved in 2 minutes.
Example: [1,2,3,10,1,2,3,7,1,2,5] => 48

I got confused by the dolphin. If dolphin is True than the shark speed is divided in half, nothing else.

A little hint: It's about index in the preloaded list

[ [p, sum of all i_j of I for which p is a prime factor (p positive) of i_j] ...]

[[p, sum of all numbers from the list that are divisible with p]]

p = prime number

-7 is the lowest in the list but in your result doesn't appear. This kata is a little tricky.

With f0 > 0, 0 is omitted, you need to include 0 in checking the result.