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  1. import java.util.*;
  2. class M{
  3.   static List c(int n){
  4.     List<Integer> l = new ArrayList();
  5.     int i = 1;
  6.     for(; i++ < n; l.add(i));
  7.     for(i = 1; i++ < n;){
  8.       for(int x : l){
  9.         if(i != x & x%i < 1 & l.indexOf(i) >= 0){
  10.           l.remove((Integer)i);
  11.           l.remove((Integer)x);
  12.           break;
  13.         }
  14.       }
  15.     }
  16.     return l;
  17.   }
  18.  
  19.   public static void main(String[] a){
  20.     System.out.println(Arrays.toString(c(2).toArray()));
  21.     System.out.println(Arrays.toString(c(6).toArray()));
  22.     System.out.println(Arrays.toString(c(15).toArray()));
  23.     System.out.println(Arrays.toString(c(20).toArray()));
  24.     System.out.println(Arrays.toString(c(22).toArray()));
  25.   }
  26. }
Success #stdin #stdout 0.04s 711168KB
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stdin
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Standard input is empty
stdout
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[2]
[5]
[8, 9, 11, 12, 13, 15]
[11, 12, 13, 15, 17, 19, 20]
[12, 13, 15, 17, 19, 20, 21]
https://ideone.com/EDldZq
language:
Java (12.0.1)
created:
7 years ago
visibility:
public

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