this is a great solution

in the discription, I believe isPerfect should be called a function not a method.

i really could not think of a way to do this recursively. nicely done.

Ah, i see the ambiguity in my statement.
i think it's quite significantly harder than other 7kyu problems, and also requires an understanding of higher level cs and math concepts. 7kyu should be for people who are learning the syntax, keywords, and functions of a language. idk, i'm not the best with recursion, and there is a need for low level recursived katas so that people can learn about it. This one just took me like an hour.

there is no universe in which this is 7kyu. this needs to be changed.

thanks! i really tried to make it make sense.

wow, what a great answer!

Wish i would have thought of that!

Thanks!