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| ANSI Common Lisp 12 Numbers 12.2 Dictionary of Numbers
12.2.32 gcd | Function
  Syntax: gcd `&rest` integers greatest-common-denominator Arguments and Values: integer - an integer. greatest-common-denominator - a non-negative integer. Description: Returns the greatest common divisor of integers. If only one integer is supplied, its absolute value is returned. If no integers are given, gcd returns `0`, which is an identity for this operation. Examples:
       (gcd)  0
       (gcd 60 42)  6
       (gcd 3333 -33 101)  1
       (gcd 3333 -33 1002001)  11
       (gcd 91 -49)  7
       (gcd 63 -42 35)  7
       (gcd 5)  5
       (gcd -4)  4
  Exceptional Situations: Should signal an error of type type-error if any integer is not an integer. See Also: lcm Notes: For three or more arguments,
       (gcd b c ... z) ==(gcd (gcd a b) c ... z)
Allegro CL Implementation Details: None.

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