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  1. S

    how do you solve x^2 congruent 16 (mod 60) ? is there a formula?

    another problem is x^2 congruent 7 (mod 113)
  2. S

    how do you evaluate a euler number? for example euler(120) . the answer is 32 .....

    ...but i don't know why,.? is there a formula for evaluating such a number?
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