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 A248398 #12 Oct 13 2019 04:18:08 %S A248398 11,19,35,67,91,105,115,123,129,179,195,201,227,235,249,273,347,393, %T A248398 403,419,427,435,473,483,563,611,635,683,691,705,715,739,753,779,787, %U A248398 795,817,843,851,993,1051,1115,1121,1123,1177,1209,1265,1347,1401,1435,1441 %N A248398 Noncongruent squarefree numbers n with A248394(n)/d(n) = -1, where d(n) = A000005(n). %H A248398 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 A248398 Cf. A000005, A003273, A165564, A248394, A248395, A248397-A248407. %K A248398 nonn %O A248398 1,1 %A A248398 _N. J. A. Sloane_, Oct 20 2014 %E A248398 More terms from _Amiram Eldar_, Oct 13 2019