| #### D.12.1.5 euler Procedure from library `aksaka.lib` (see aksaka_lib). Usage: euler(r); Return: bigint phi(r), where phi is Eulers phi-function Note: first r is factorized with proc PollardRho, then phi(r) is calculated with the help of phi(p) of every factor p; Example:
    LIB "aksaka.lib";
    euler(99991);
    ==> 99990

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