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 A374017 #27 Jun 29 2024 09:08:18 %S A374017 0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,1,0,0,0,0,1,0,0,0,0,0,0,1,0,0,0,0,0,0, %T A374017 0,0,1,0,0,0,0,0,0,0,0,1,0,1,1,0,0,0,0,1,0,0,0,0,0,0,2,0,0,0,0,0,0,0, %U A374017 0,1,0,0,0,0,0,1,0,0,0,0,1,0,0,0,0,0,0,0,0,0,0,0,1,1,0,0,0,0,0,0,1,0,0,1,0,0,0,0,2 %N A374017 Number of solutions to x^2 + 11*y^2 = n in positive integers x and y. %H A374017 Seiichi Manyama, <a href="/A374017/b374017.txt">Table of n, a(n) for n = 0..10000</a> %o A374017 (PARI) a(n) = if(n==0, 0, sum(k=1, sqrtint((n-1)\11), issquare(n-11*k^2))); %Y A374017 Cf. A092573, A216279, A216511. %Y A374017 Cf. A374160. %K A374017 nonn,easy %O A374017 0,61 %A A374017 _Seiichi Manyama_, Jun 29 2024