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 A112055 #13 May 08 2021 08:35:18
%S A112055 2,3,5,7,8,12,13,15,17,18,20,22,23,27,28,30,32,33,35,37,38,40,42,43,
%T A112055 47,48,50,52,53,55,57,58,62,63,65,67,68,70,72,73,75,77,78,82,83,85,87,
%U A112055 88,90,92,93,97,98,100,102,103,107,108,110,112,113,117,118,120,122
%N A112055 a(n) = A112054(n)/6.
%t A112055 a112046[n_]:=Block[{i=1}, While[JacobiSymbol[i, 2n + 1]==1, i++]; i]; Select[Range[1000], a112046[2#] - a112046[2# - 1] != 0 &]/6 (* _Indranil Ghosh_, May 25 2017 *)
%o A112055 (Python)
%o A112055 from sympy import jacobi_symbol as J
%o A112055 def a112046(n):
%o A112055 i=1
%o A112055 while True:
%o A112055 if J(i, 2*n + 1)!=1: return i
%o A112055 else: i+=1
%o A112055 def a(n): return a112046(2*n) - a112046(2*n - 1)
%o A112055 print([n//6 for n in range(1, 201) if a(n)!=0]) # _Indranil Ghosh_, May 25 2017
%Y A112055 Cf. A112054, A112082 (complement), A112085 (first differences).
%K A112055 nonn
%O A112055 1,1
%A A112055 _Antti Karttunen_, Aug 27 2005