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 A248402 #10 Oct 13 2019 04:17:47 %S A248402 107,251,283,331,547,633,643,699,737,771,883,1041,1147,1163,1307,1459, %T A248402 1483,1497,1523,1531,1619,1627,1699,1793,1883,1915,1923,2049,2179, %U A248402 2251,2283,2361,2363,2411,2427,2433,2443,2467,2539,2651,2843,2971,3091,3147,3187,3203 %N A248402 Noncongruent squarefree numbers n with A248394(n)/d(n) = -3, where d(n) = A000005(n). %H A248402 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 A248402 Cf. A000005, A003273, A248394, A248395, A248397-A248406. %K A248402 nonn %O A248402 1,1 %A A248402 _N. J. A. Sloane_, Oct 20 2014 %E A248402 More terms from _Amiram Eldar_, Oct 13 2019