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 A177989 #5 Sep 08 2022 08:45:53 %S A177989 2,3,4,5,6,8,9,10,11,13,14,18,19,20,21,22,23,24,25,26,27,28,29,30,33, %T A177989 34,35,36,37,38,39,40,41,42,43,44,46,47,48,50,51,52,53,54,55,57,58,59, %U A177989 61,62,63,64,66,67,68,69,70,73,74,75,76,78,79 %N A177989 Numbers n such that quartic equation y^2=x^4-n has no integer solution. %C A177989 Complement to this sequence see A177989. %C A177989 Numbers n such that the quartic curve y^2=x^4+n doesn't have integral points. see A177987. %o A177989 (Magma) IntegralQuarticPoints([1,0,0,0,-79]); %Y A177989 Cf. A054504, A081121, A177986, A177987, A177988, A177989. %K A177989 nonn %O A177989 1,1 %A A177989 _Artur Jasinski_, May 16 2010