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 A248404 #13 Oct 13 2019 04:17:43 %S A248404 26,42,66,106,186,202,266,418,498,530,554,570,634,682,690,754,762,770, %T A248404 834,858,874,930,1010,1034,1082,1114,1130,1266,1290,1298,1354,1370, %U A248404 1410,1490,1570,1586,1634,1698,1834,1930,1946,1986,1994,2002,2074,2082,2090,2146 %N A248404 Noncongruent squarefree numbers n with A248395(n)/d(n) = -1, where d(n) = A000005(n). %H A248404 J. B. Tunnell, <a href="http://dx.doi.org/10.1007/BF01389327">A classical Diophantine problem and modular forms of weight 3/2</a>, Invent. Math., 72 (1983), 323-334. %Y A248404 Cf. A000005, A003273, A248394, A248395, A248397-A248406. %K A248404 nonn %O A248404 1,1 %A A248404 _N. J. A. Sloane_, Oct 20 2014 %E A248404 More terms from _Amiram Eldar_, Oct 13 2019