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Forum: Analysis & Analytic Number Theory 2020-10-11, 18:11
Replies: 8
Views: 12,569
Posted By Till
For completeness I'ld like to add that it's more...

For completeness I'ld like to add that it's more than counting.

For any n>2, we can obtain the values of A004215 (natural numbers representable by 4 squares but no less) < 2^n from the set of...
Forum: Analysis & Analytic Number Theory 2020-09-21, 16:27
Replies: 8
Views: 12,569
Posted By Till
In my opinion, any cross-reference in OEIS is a...

In my opinion, any cross-reference in OEIS is a big help.
Forum: Analysis & Analytic Number Theory 2020-09-21, 14:44
Replies: 8
Views: 12,569
Posted By Till
Thanks for your analysis. I submitted the...

Thanks for your analysis. I submitted the conjecture to OEIS.
Forum: Analysis & Analytic Number Theory 2020-09-20, 16:38
Replies: 8
Views: 12,569
Posted By Till
Sorry, I made a little mistake: It is...

Sorry, I made a little mistake: It is http://oeis.org/A004215, not A004015...
Forum: Analysis & Analytic Number Theory 2020-09-20, 12:23
Replies: 8
Views: 12,569
Posted By Till
Quadratic residue counts related to four squares representation counts

Hi all,
today I found something curious...

Let X(m) be the number of distinct quadratic residues mod m. (A023105 for m=2^n)
Let Y(m) be the number of n < m that can be expressed as a sum of 4...
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