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| ANSI Common Lisp 2 Syntax 2.4 Standard Macro Characters 2.4.8 Sharpsign ### 2.4.8.9 Sharpsign X `#X` rational reads rational in hexadecimal (radix 16). The digits above `9` are the letters `A` through `F` (the lowercase letters `a` through `f` are also acceptable). For example,
     #xF00 ==3840
     #x105 ==261 ;10516
The consequences are undefined if the token immediately following the `#X` does not have the syntax of a hexadecimal (i.e., radix 16) rational.

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