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 A078520 #7 Jul 03 2025 09:30:32 %S A078520 414560,2767624,8332208,11289040,14173720,16281009,18796760,41084175, %T A078520 65932985,106161120,122055375,146627384,582665296,630662624,769321280, %U A078520 1166705840,1670617271,1662997663,1593513080 %N A078520 Consider primitive solutions (x,y,z) to x^4+y^4+z^4=w^4 with 0<x<=y<=z arranged in order of increasing w; sequence gives z values. %D A078520 See A003828 for references and links. %Y A078520 Cf. A003828, A078518, A078519. %K A078520 nonn,more %O A078520 1,1 %A A078520 _N. J. A. Sloane_, Jan 07 2003 %E A078520 Data corrected and extended using A003828 by _Sean A. Irvine_, Jul 03 2025