h.phi

来自「强大的数学工具包」· PHI 代码 · 共 23 行

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                               *    phi    *
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        "Eulerian phi-function"
        SYNTAX: X = phi(A)

        A is an expression whose value is a positive integer.

        X is assigned the value of the Eulerian phi-function at A.


        Example 1: (correct)

                phi(34 * gcd(456, 123) - 45)


        Example 2: (incorrect)

                phi(-458/79)
                
_ERR_NR_016