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 A166055 #5 Feb 22 2025 19:16:59
%S A166055 19,35,59,63,103,131,251,279,299,371,395,419,495,711,755,899,927,943,
%T A166055 971,1091,1139,1143,1207,1359,1595,1739,1743,1791,1811,1931,1979,2007,
%U A166055 2219,2411,2423,2435,2439,2651,2655,2703,2771,2847,2871,2915,2939
%N A166055 Integers of the form 4n+3 for which Sum_{i=1..u} J(i,4n+3) obtains value zero exactly 5 times, when u ranges from 1 to (4n+3). Here J(i,k) is the Jacobi symbol.
%C A166055 Third row of A166092.
%F A166055 a(n) = A004767(A166054(n)).
%Y A166055 Cf. A004767, A166054, A166092.
%K A166055 nonn
%O A166055 1,1
%A A166055 _Antti Karttunen_, Oct 08 2009