Loop problem help plz!

Question

So this problem is just ridiculous i tried and tried and all it was is pointless i just cant solve it Write a console-based application that displays every perfect number from 1 through 1000. A number is perfect if it equals the sum of all the smaller positive integers that divide evenly into it. For example 6 is perfect because 1 2 and 3 divide evenly into it and their sum is 6

Vulpes · Answer

It's not as difficult as it looks as there are only 3 such numbers: 6 28 and 496: using System; using System.Collections.Generic; class Perfect { static void Main() { List factors = new List (); Console.WriteLine(The perfect numbers less than or equal to 1000 are :
); for (int i = 2; i { factors.Clear(); factors.Add(1); for(int j = 2; j { if (i % j == 0) factors.Add(j); } int sum = 0; for (int k = 0; k { sum += factors[k]; } if (sum == i) { for (int l = 0; l { Console.Write({0} +  factors[l]); } Console.Write({0} = {1}
 factors[factors.Count - 1] i); } } } }

Vulpes · Answer

I can manage the occasional article but writing a book would be too heavy a commitment in time. These sorts of questions are really an exercise in thinking. To find out whether a number is perfect or not you need to: 1. Get a list of all its proper factors (i.e. all numbers which divide it exactly except itself). 2. Add up these factors and see whether they equal the number itself. We therefore need to carry out this exercise for each number between 2 and 1000. '1' can't be perfect as its only factor is itself. We can abbreviate the search a little as numbers which are greater than i/2 can't be factors of i. Incidentally I didn't need to do much thinking myself here as I'd already done it in this thread: http://www.c-sharpcorner.com/Forums/Thread/127389/perfectabundantnon-abundant-and-prime-numbers.aspx

Prime b · Answer

Have you ever thought about writing a book? Or at least like write a solver to popular books? Also how am I supposed to know how to solve this problem? When there's no example in the book that I can use to solve the problem there's nothing....