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Postby james_bond » Sun May 17, 2009 4:18 pm
Postby stapel_eliz » Sun May 17, 2009 7:22 pm
Postby Martingale » Mon May 18, 2009 6:11 am
I think the greatest common divisor will be 2 for odd values of "a", and 1 for even values of "a". But you probably need to prove this....
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