public static void printCubeFree ( int n ) {
  boolean [ ] cubFree = new boolean [ n + 1 ] ;
  for ( int i = 0 ;
  i <= n ;
  i ++ ) cubFree [ i ] = true ;
  for ( int i = 2 ;
  i * i * i <= n ;
  i ++ ) {
    if ( cubFree [ i ] ) {
      for ( int multiple = 1 ;
      i * i * i * multiple <= n ;
      multiple ++ ) {
        cubFree [ i * i * i * multiple ] = false ;
      }
    }
  }
  for ( int i = 2 ;
  i <= n ;
  i ++ ) {
    if ( cubFree [ i ] == true ) System . out . print ( i + " " ) ;
  }
}

public static void printCubeFree ( int n ) { boolean [ ] cubFree = new boolean [ n + 1 ] ; for ( int i = 0 ; i <= n ; i ++ ) cubFree [ i ] = true ; for ( int i = 2 ; i * i * i <= n ; i ++ ) { if ( cubFree [ i ] ) { for ( int multiple = 1 ; i * i * i * multiple <= n ; multiple ++ ) { cubFree [ i * i * i * multiple ] = false ; } } } for ( int i = 2 ; i <= n ; i ++ ) { if ( cubFree [ i ] == true ) System . out . print ( i + " ▁ " ) ; } }
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