THE YEAR PUZZLE (program by Heiner Marxen)
Version: $Revision: 1.18 $ $Date: 2006/02/01 17:22:10 $
Target signature = 2006
Without permutation of signature digits.
Intermediate (de)nominator range = -500000 .. 500000
Result range = 0 .. 200
With standard binary operators: + - * /
With standard  unary operators: - sqrt
With parentheses.
With concatenation.
With exponentiation (^).
With factorial (!).
With even/odd factorial (!!).
With decimal point.
Could not solve 79 of 201 values [39.3%].
     0 = 20*0*6
     1 = 2^0+0*6
     2 = 2+0+0*6
     3 = 2+0!+0*6
     4 = -2+0+0+6
     5 = -20^0+6
     6 = 20*0+6
     7 = 20^0+6
     8 = 2+0+0+6
     9 = 2+0!+0+6
    10 = 2+0!+0!+6
    11 = (2+0!)!-0!+6
    12 = 2*(0+0+6)
    13 = 20-0!-6
    14 = 20+0-6
    15 = 20+0!-6
    16 = 2*(0!+0!+6)
    17 = 2+(0-0!+6)!!
    18 = (2+0!+0)*6
    19 = 20-0!^6
    20 = 20+0*6
    21 = 20+0!^6
    22 = -2+(-0!-0!+6)!
    23 = -.2^(-0!-0!)+6!!
    24 = (-2+0+0+6)!
    25 = 20-0!+6
    26 = 20+0+6
    27 = 20+0!+6
    28 = -20+0+6!!
    29 = -20+0!+6!!
    30 = (2+0!+0!)!+6
    31 = .2^(-0!-0!)+6
    32 = 2^(0-0!+6)
    33 = -((2+0!)!-0!)!!+6!!
    34 = -(.2^(-0!))!!+0!+6!!
    35 = 20+(-0!+6)!!
    36 = 20^(-0!)*6!
    37 = -sqrt((.2^(-0!))!+0!)+6!!
    38 = sqrt(2*(0!+0!+6!))
    39 = ?
    40 = -(2+0!+0!)!!+6!!
    41 = -(2+0!)!-0!+6!!
    42 = (2+0!)!*(0!+6)
    43 = -(2+0!)!+0!+6!!
    44 = -2-0!-0!+6!!
    45 = -2+0-0!+6!!
    46 = -2+0+0+6!!
    47 = -20^0+6!!
    48 = 2*(-0!-0!+6)!
    49 = 20^0+6!!
    50 = 2+0+0+6!!
    51 = 2+0!+0+6!!
    52 = 2+0!+0!+6!!
    53 = (2+0!)!-0!+6!!
    54 = (2+0!)!+0+6!!
    55 = (2+0!)!+0!+6!!
    56 = (2+0!+0!)!!+6!!
    57 = ((2+0!)!+0!)!!-6!!
    58 = ?
    59 = sqrt((.2^(-0!))!+0!)+6!!
    60 = 2^(-0!)*(-0!+6)!
    61 = ?
    62 = -2+(0!+0!)^6
    63 = ((2+0!)!-0!)!!+6!!
    64 = 2^(0+0+6)
    65 = ?
    66 = 2+(0!+0!)^6
    67 = 20-0!+6!!
    68 = 20+0+6!!
    69 = -2+sqrt(0!+(0!+6)!)
    70 = ?
    71 = sqrt(2^0+(0!+6)!)
    72 = (2+0!+0!)!+6!!
    73 = 2+sqrt(0!+(0!+6)!)
    74 = ?
    75 = .2^(-0!)*(-0!+6)!!
    76 = ?
    77 = ?
    78 = ?
    79 = ?
    80 = ((2+0!)!)!!/0.6
    81 = ?
    82 = ?
    83 = ?
    84 = (.2-0!)*-(0!+6)!!
    85 = -20+(0!+6)!!
    86 = ?
    87 = ?
    88 = ?
    89 = ?
    90 = ((2+0!)!-0!)!!*6
    91 = ?
    92 = -2*(0!+0!-6!!)
    93 = ?
    94 = 2*(0-0!+6!!)
    95 = ((2+0!)!)!!-0!+6!!
    96 = 2*(0+0+6!!)
    97 = ((2+0!)!)!!+0!+6!!
    98 = 2*(0!+0+6!!)
    99 = ((2+0!)!+0!)!!-6
   100 = -20*(0!-6)
   101 = ?
   102 = -2-0!+(0!+6)!!
   103 = -2+(0!+0+6)!!
   104 = -2^0+(0!+6)!!
   105 = (20^0+6)!!
   106 = 2^0+(0!+6)!!
   107 = 2+(0!+0+6)!!
   108 = 2+0!+(0!+6)!!
   109 = ?
   110 = .2^(-0!)+(0!+6)!!
   111 = (2+0!)!+(0!+6)!!
   112 = ?
   113 = (.2^(-0!))!-0!-6
   114 = (20-0!)*6
   115 = (.2^(-0!))!+0!-6
   116 = ?
   117 = -2-0!+(-0!+6)!
   118 = -2+(0-0!+6)!
   119 = -2^0+(-0!+6)!
   120 = 20*(0+6)
   121 = 2^0+(-0!+6)!
   122 = 2+(0-0!+6)!
   123 = 2+0!+(-0!+6)!
   124 = ?
   125 = sqrt(((2+0!)!-0!)^6)
   126 = (20+0!)*6
   127 = (.2^(-0!))!+0!+6
   128 = 2^(0!+0+6)
   129 = ?
   130 = ?
   131 = ?
   132 = ?
   133 = ?
   134 = ?
   135 = (.2^(-0!))!!+(-0!+6)!
   136 = ?
   137 = ?
   138 = ?
   139 = ?
   140 = 20*(0!+6)
   141 = (2+0!)*(-0!+6!!)
   142 = 2*sqrt(0!+(0!+6)!)
   143 = ?
   144 = (2+0!+0!)!*6
   145 = ?
   146 = ?
   147 = (2+0!)*(0!+6!!)
   148 = ?
   149 = ?
   150 = .2^(-0!-0!)*6
   151 = ?
   152 = 200-6!!
   153 = ((2+0!)!+0!)!!+6!!
   154 = ?
   155 = ?
   156 = ?
   157 = ?
   158 = ?
   159 = ?
   160 = ?
   161 = ?
   162 = ?
   163 = ?
   164 = ?
   165 = ?
   166 = ?
   167 = (.2^(-0!))!-0!+6!!
   168 = ((2+0!)!-0!)!+6!!
   169 = (.2^(-0!))!+0!+6!!
   170 = ?
   171 = ?
   172 = ?
   173 = ?
   174 = ?
   175 = ((2+0!)!+0!)!!/.6
   176 = ?
   177 = ?
   178 = ?
   179 = ?
   180 = 2^(-0!-0!)*6!
   181 = ?
   182 = ?
   183 = ?
   184 = ?
   185 = ?
   186 = ?
   187 = ?
   188 = ?
   189 = ?
   190 = ?
   191 = ?
   192 = 2*(0!+0!)*6!!
   193 = ?
   194 = 200-6
   195 = ?
   196 = ?
   197 = ?
   198 = ?
   199 = ?
   200 = (.2^(-0!))!/0.6