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Search: Posts Made By: R. Gerbicz
Forum: Analysis & Analytic Number Theory 2020-09-21, 15:41
Replies: 8
Views: 12,561
Posted By R. Gerbicz
It is a triviality, once you know the sum of a...

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.
Forum: Analysis & Analytic Number Theory 2020-09-20, 16:58
Replies: 8
Views: 12,561
Posted By R. Gerbicz
It says that there are floor(2^n+10)/6 quadratic...

It says that there are floor(2^n+10)/6 quadratic residues mod 2^n.


You need 4 squares for x iff x=4^e*(8*k+7) it is pretty old fact.
If you want the count for this for x<2^n then you can set...
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