(Solved)Im stuck, at C# lesson 23: multible by 3. Will someone help?

Question

solved 3 first but the remainders 4 and 5 are hidden but failed so I cant even know whats wrong. Kinda frustrating.... code is below

https://code.sololearn.com/cef1Av5489K6/?ref=app

Answer 1

The C# task requires the solution to be printed in the same line.

Same Line (Correct):
12*45*7

Different Line (Wrong):
1
2
*
4
5
*
7

Answer 2

Sorry guys, but it seems to make no difference. Both Write and WriteLine gives me a correct solution for the first 3 attempts. I even tried putting in N value of 1000 and it outputs every 3rd number as *, which is the equivalent as a number multiple by 3. but still the hidden 4th and 5th remain unsolved.

Answer 3

Alright. Moving the x definition and setting an end to the for loop solved the rest.
For(int x = 1; x <= N; x++)

The problem appeared when I entered a 3, 6, 9, 12, 15, 18 etc.. it would run indefinitely.

Thanks for the inputs.