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You need to output a couple (N,g) where N is an integer whose bitlength is n (in other words it has n digits in base 2) and g is an integer relatively prime to N. I guess that your N should be a product of two primes p and q as in the description above. You may use the function random_prime of Sage for that purpose.

I confess that I do not understand this first question as it is not used in the next items...