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| ANSI Common Lisp 2 Syntax 2.4 Standard Macro Characters 2.4.8 Sharpsign ### 2.4.8.10 Sharpsign R `#nR` `#radixRrational` reads rational in radix radix. radix must consist of only digits that are interpreted as an integer in decimal radix; its value must be between 2 and 36 (inclusive). Only valid digits for the specified radix may be used. For example, `#3r102` is another way of writing `11` (decimal), and `#11R32` is another way of writing `35` (decimal). For radices larger than 10, letters of the alphabet are used in order for the digits after `9`. No alternate `#` notation exists for the decimal radix since a decimal point suffices. The next figure contains examples of the use of `#B`, `#O`, `#X`, and `#R`.
Radix Indicator Example
`#2r11010101` | ;Another way of writing `213` decimal
`#b11010101` | ;Ditto
`#b+11010101` | ;Ditto
`#o325` | ;Ditto, in octal radix
`#xD5` | ;Ditto, in hexadecimal radix
`#16r+D5` | ;Ditto
`#o-300` | ;Decimal `-192`, written in base 8
`#3r-21010` | ;Same thing in base 3
`#25R-7H` | ;Same thing in base 25
`#xACCEDED` | ;`181202413`, in hexadecimal radix
The consequences are undefined if the token immediately following the `#nR` does not have the syntax of a rational in radix n.

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