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Old 2020-09-21, 16:27   #6
Till
 
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"Tilman Neumann"
Jan 2016
Germany

42810 Posts
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Quote:
Originally Posted by R. Gerbicz View Post
It is a triviality, once you know the sum of a geometric serie, could be known for 2400 years. To make things easier split the proof for odd/even n.

In my opinion, any cross-reference in OEIS is a big help.
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