Programming Answer 5 - GNU Emacs Calc Manual

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3.7.62 Programming Tutorial Exercise 5

     2:  1              1:  1.61803398502         2:  1.61803398502
     1:  20                 .                     1:  1.61803398875
         .                                            .

        1 <RET> 20         Z < & 1 + Z >                I H P

This answer is quite accurate.