# include <stdio.h>

int main ( )
{
  int i;
  int j;
  int n_max;

  n_max = 25;

  for ( i = 2; i <= n_max; i++ )
  {
    printf ( " %i: ", i );

    for ( j = 1; j <= i; j++ )
    {
      if ( i % j == 0 )
      {
        printf ( " %i", j );
      }
    }
    printf ( "\n" );
  }
  return 0;
}