- Removal of "if (auto factors = ...)": coding standards suggest to avoid mixing conditional tests with actions. Keeping code more tidy is safer.
Also in D testing array emptiness like that is generally dangerous. The idiomatic and correct way to do it in D is to use empty. Because in general arrays with zero length can be true:
Another thing: the problem asks to return the results for 16758243290880, 24959017348650, 14593825548650, while your version of the program doesn't even show the last numbers. This is bad. The Python entry shows all three of them.
Bye, bearophile
