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 A248399 #10 Oct 13 2019 04:18:00 %S A248399 73,155,185,203,241,281,329,355,545,553,579,601,627,641,697,755,763, %T A248399 785,865,937,1097,1139,1193,1227,1243,1289,1299,1353,1371,1457,1465, %U A248399 1537,1721,1753,1763,1841,1865,1913,1937,1961,2017,2041,2105,2177,2281,2307,2353 %N A248399 Noncongruent squarefree numbers n with A248394(n)/d(n) = 2, where d(n) = A000005(n). %H A248399 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 A248399 Cf. A000005, A003273, A248394, A248395, A248397-A248406. %K A248399 nonn %O A248399 1,1 %A A248399 _N. J. A. Sloane_, Oct 20 2014 %E A248399 More terms from _Amiram Eldar_, Oct 13 2019