Agreed, I only checked for 0's and it passed the tests...

My bad, I'm new to Java, I thought return nil meant that, thank you.

It won't let me write it, but List has type of elements long[] and the little arrow is pointing at "L" of the word List.

Hi. Im not sure if it's just some dumb problem on my side, but whenever I try to run the tests or attempt(Java), it throws this compilation error(even if there's just return null in the method):

/home/codewarrior/src/main/java/RemovedNumbers.java:3: error: cannot find symbol
public static List<long[]> removNb(long n) {
^
symbol: class List
location: class RemovedNumbers

Thanks.