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 A219921 #20 Oct 24 2013 03:27:00 %S A219921 236674,260658,282018,300834,334818,478338,637794,650034,650658, %T A219921 671778,708483,708834,729938,789378,811538,816578,832274,849954, %U A219921 941859,989043,1042083,1045539,1099203,1099458,1102258,1179378,1243074,1257954,1283874,1323234,1334979 %N A219921 Numbers expressible as the sum of four nonnegative fourth-powers in four different ways. %C A219921 A natural extension of the two-sets-of-two-cubes taxi-cab numbers (A001235). %C A219921 a(4) is the first number which contains distinct fourth-powers in all four sets of four, and is therefore also A146756(4). %H A219921 Christian N. K. Anderson, <a href="/A219921/b219921.txt">Table of n, a(n) for n = 1..1000</a> %H A219921 Christian N. K. Anderson, <a href="/A219921/a219921.txt">Decomposition</a> of the first 1000 terms into four sets of four fourth powers. %e A219921 a(1) = 236674 = 1^4+2^4+7^4+22^4 = 3^4+6^4+18^4+19^4 = 7^4+14^4+16^4+19^4 = 8^4+16^4+17^4+17^4. %Y A219921 Other sums of four fourth powers: A176197, A133526. %Y A219921 Cf. A146756, A230477. %Y A219921 Cf. A001235, A011541. %K A219921 nonn %O A219921 1,1 %A A219921 _Kevin L. Schwartz_ and _Christian N. K. Anderson_, Apr 12 2013