THE YEAR PUZZLE (program by Heiner Marxen)
Version: $Revision: 1.18 $ $Date: 2006/02/01 17:22:10 $
Target signature = 1997
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 2 of 201 values [1.0%].
     0 = 1*(9-9)*7
     1 = 1+(9-9)*7
     2 = 1^9*9-7
     3 = 19-9-7
     4 = (19+9)/7
     5 = (1+9)/(9-7)
     6 = -1+9/9*7
     7 = 1*9/9*7
     8 = 1+9/9*7
     9 = 1+9/9+7
    10 = -1+9+9-7
    11 = 1*9+9-7
    12 = 1+9+9-7
    13 = 1-9+sqrt(9)*7
    14 = (1+9/9)*7
    15 = -1^9+9+7
    16 = (1-9)*(-9+7)
    17 = 19-9+7
    18 = 1*9*(9-7)
    19 = 1+9*(9-7)
    20 = (1+9)*(9-7)
    21 = 19+9-7
    22 = 1+9/sqrt(9)*7
    23 = 19+sqrt(9+7)
    24 = -1+9+9+7
    25 = 1*9+9+7
    26 = 1+9+9+7
    27 = 1/sqrt(sqrt(9)/sqrt(9)^7)
    28 = (1+9/sqrt(9))*7
    29 = 19+sqrt(9)+7
    30 = 1*9+sqrt(9)*7
    31 = 1+9+sqrt(9)*7
    32 = (-1+9)*sqrt(9+7)
    33 = -1+sqrt(9)*9+7
    34 = 1*sqrt(9)*9+7
    35 = 19+9+7
    36 = 1*9*sqrt(9+7)
    37 = 1+9*sqrt(9+7)
    38 = 19*(9-7)
    39 = -(1+sqrt(9))!+9*7
    40 = 19+sqrt(9)*7
    41 = -1+(9-sqrt(9))*7
    42 = 1*(9-sqrt(9))*7
    43 = 1+(9-sqrt(9))*7
    44 = -19+9*7
    45 = 1*sqrt(9)+sqrt(9)!*7
    46 = -1+sqrt(9)!*9-7
    47 = -1+sqrt(9)*(9+7)
    48 = 1*sqrt(9)*(9+7)
    49 = 1+sqrt(9)*(9+7)
    50 = 19*sqrt(9)-7
    51 = 1*9+sqrt(9)!*7
    52 = 1+9+sqrt(9)!*7
    53 = -1-9+9*7
    54 = -1*9+9*7
    55 = 1-9+9*7
    56 = (1^9-9)*-7
    57 = (1+sqrt(9))^sqrt(9)-7
    58 = 1-sqrt(9)!+9*7
    59 = -1-sqrt(9)+9*7
    60 = -1*sqrt(9)+9*7
    61 = 1-sqrt(9)+9*7
    62 = -1^9+9*7
    63 = 1^9*9*7
    64 = 1^9+9*7
    65 = (1-9)*-9-7
    66 = 1*sqrt(9)+9*7
    67 = 1+sqrt(9)+9*7
    68 = -1+sqrt(9)!+9*7
    69 = 1*sqrt(9)!+9*7
    70 = (19-9)*7
    71 = -1+9+9*7
    72 = 1*9+9*7
    73 = 1+9+9*7
    74 = 1*9*9-7
    75 = 1+9*9-7
    76 = 19*sqrt(9+7)
    77 = (-1+sqrt(9)+9)*7
    78 = -19+97
    79 = (1-9)*-9+7
    80 = -1+9^(9-7)
    81 = 1*9^(9-7)
    82 = 19+9*7
    83 = (1+9)*9-7
    84 = 1*(sqrt(9)+9)*7
    85 = 1+(sqrt(9)+9)*7
    86 = -1+(sqrt(9)!)!/9+7
    87 = -1-9+97
    88 = 1*9*9+7
    89 = 1-9+97
    90 = 1*9*(sqrt(9)+7)
    91 = -1+99-7
    92 = 1*99-7
    93 = 1+99-7
    94 = -1*sqrt(9)+97
    95 = 1-sqrt(9)+97
    96 = -1^9+97
    97 = (1+9)*9+7
    98 = 1^9+97
    99 = -1+sqrt(9)+97
   100 = 1*sqrt(9)+97
   101 = 1+sqrt(9)+97
   102 = -1+sqrt(9)!+97
   103 = 1*sqrt(9)!+97
   104 = (-1+9^sqrt(9))/7
   105 = -1+9+97
   106 = 1*9+97
   107 = 1+9+97
   108 = 1*9/sqrt(9)+7!!
   109 = 1+9/sqrt(9)+7!!
   110 = (-1+sqrt(9)!)!-sqrt(9)-7
   111 = -1+9!!/9+7
   112 = (19-sqrt(9))*7
   113 = (-1+9-sqrt(9))!-7
   114 = 1+(sqrt(9)!)!/sqrt(9)!-7
   115 = 19-9+7!!
   116 = 19+97
   117 = 1*9*(sqrt(9)!+7)
   118 = 1+9*(sqrt(9)!+7)
   119 = (1-9-9)*-7
   120 = (-1-9/9+7)!
   121 = 19*sqrt(9)!+7
   122 = -1+sqrt(9+sqrt(9)*7!)
   123 = 1*sqrt(9+sqrt(9)*7!)
   124 = 1+sqrt(9+sqrt(9)*7!)
   125 = -1+(9+9)*7
   126 = 1*(9+9)*7
   127 = 1+(9+9)*7
   128 = (1-9)*(-9-7)
   129 = 1+(sqrt(9)!/sqrt(9))^7
   130 = (1+9)*(sqrt(9)!+7)
   131 = -1+sqrt(9)*9+7!!
   132 = (-1+sqrt(9)!)^sqrt(9)+7
   133 = (1+9+9)*7
   134 = -1^9+9!!/7
   135 = 1^9*9!!/7
   136 = (-1+sqrt(9)!)!+9+7
   137 = (1+sqrt(9))!*sqrt(9)!-7
   138 = 1*sqrt(9)+9!!/7
   139 = 1+sqrt(9)+9!!/7
   140 = 1/sqrt(9)!/sqrt(9)!*7!
   141 = (-1+sqrt(9)!)!+sqrt(9)*7
   142 = 1+sqrt(9)!+9!!/7
   143 = -1+9*(9+7)
   144 = 1*9*(9+7)
   145 = 1+9*(9+7)
   146 = 1+(sqrt(9)!)!!+97
   147 = (1+sqrt(9)!)*sqrt(9)*7
   148 = 1+(sqrt(9)!)!!-sqrt(9)!+7!!
   149 = -1+(sqrt(9)!)!!-sqrt(9)+7!!
   150 = (1-sqrt(9)!)*-9+7!!
   151 = (1+sqrt(9))!*sqrt(9)!+7
   152 = 19*sqrt(9+7)!!
   153 = (1-9)*-sqrt(9)!+7!!
   154 = (19+sqrt(9))*7
   155 = -1+(sqrt(9)!)!!+sqrt(9)+7!!
   156 = 1*sqrt(9)+(sqrt(9)!)!!+7!!
   157 = 1+(sqrt(9)!)!!+sqrt(9)+7!!
   158 = -1+sqrt(9)!*9+7!!
   159 = 1*sqrt(9)!*9+7!!
   160 = (1+9)*(9+7)
   161 = sqrt(1-sqrt(9)!*((sqrt(9)!)!-7!))
   162 = (-1+sqrt(9)!)!+sqrt(9)!*7
   163 = 1+(sqrt(9)!)!!+9+7!!
   164 = 19*9-7
   165 = (1+9)*sqrt(9)!+7!!
   166 = 1+sqrt(9)*((sqrt(9)!)!!+7)
   167 = -1+sqrt((sqrt(9)!)!!/sqrt(9))!*7
   168 = (1-9)*-sqrt(9)*7
   169 = (1+sqrt(9))^sqrt(9)+7!!
   170 = -1-sqrt(9)*((sqrt(9)!)!!-7!!)
   171 = 19*9!!/7!!
   172 = 19+(sqrt(9)!)!!+7!!
   173 = -1+sqrt(sqrt(9)!*(sqrt(9)!+7!))
   174 = 1*sqrt(sqrt(9)!*(sqrt(9)!+7!))
   175 = (19+sqrt(9)!)*7
   176 = ?
   177 = (1-9)*-9+7!!
   178 = 19*9+7
   179 = -1+(sqrt(9)!)!/sqrt(9+7)
   180 = 1*(sqrt(9)!)!/sqrt(9+7)
   181 = 1+(sqrt(9)!)!/sqrt(9+7)
   182 = (1-sqrt(9)*9)*-7
   183 = (-1+sqrt(9)!)!+9*7
   184 = -1+(sqrt(9)!)!/9+7!!
   185 = -1+9*9+7!!
   186 = 1*9*9+7!!
   187 = 1+9*9+7!!
   188 = -1+sqrt(9)*9*7
   189 = 1*sqrt(9)*9*7
   190 = 1+sqrt(9)*9*7
   191 = -1+(sqrt(9)!)!!*sqrt(9+7)
   192 = 199-7
   193 = 1+(sqrt(9)!)!!*sqrt(9+7)
   194 = (1-sqrt(9))*-97
   195 = (1+9)*9+7!!
   196 = (19+9)*7
   197 = ?
   198 = (1-sqrt(9))*(sqrt(9)!-7!!)
   199 = (1+sqrt(9))*(sqrt(9)!)!!+7
   200 = -1+(sqrt(9)!)!!+(sqrt(9)!)!!+7!!