This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A125613 #13 Dec 19 2024 19:06:12
%S A125613 1,1,17,21,132,351,816,874,1104,4031,3286,8473,11726,11868,11233,
%T A125613 24857,28143,38247,46766,40754,66722,65017,83249,120150,156364,173013,
%U A125613 152955,184147,218763,245436,297053,327500,437030,413803,556217,488334,652335
%N A125613 Sum of the squares of the quadratic residues of prime(n).
%C A125613 For all n > 3, prime(n) divides a(n).
%D A125613 D. M. Burton, Elementary Number Theory, McGraw-Hill, Sixth Edition (2007), p. 185.
%H A125613 Nick Hobson, <a href="/A125613/b125613.txt">Table of n, a(n) for n = 1..1000</a>
%e A125613 The quadratic residues of 7=prime(4) are 1, 2 and 4. Hence a(4)=1^2 + 2^2 + 4^2=21.
%t A125613 Table[Total[ResourceFunction["QuadraticResidues"][Prime[n]]^2],{n,37}] (* _James C. McMahon_, Dec 19 2024 *)
%o A125613 (PARI) vector(37, n, p=prime(n); t=1; for(i=2, (p-1)/2, t+=((i^2)%p)^2); t)
%Y A125613 Cf. A076409, A076410, A125613-A125618.
%K A125613 easy,nonn
%O A125613 1,3
%A A125613 _Nick Hobson_, Nov 30 2006