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 A186682 #30 Feb 21 2025 22:41:30
%S A186682 0,2,19,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,
%T A186682 24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,
%U A186682 24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24
%N A186682 Total number of positive integers below 10^n requiring 18 positive biquadrates in their representation as sum of biquadrates.
%C A186682 A114322(n) + A186649(n) + A186651(n) + A186653(n) + A186655(n) + A186657(n) + A186659(n) + A186661(n) + A186663(n) + A186665(n) + A186667(n) + A186669(n) + A186671(n) + A186673(n) + A186675(n) + A186677(n) + A186680(n) + a(n) + A186684(n) = A002283(n)
%C A186682 a(n) = 24 for n >= 4. - _Nathaniel Johnston_, May 09 2011
%C A186682 Continued fraction expansion of (185-sqrt(145))/355. - _Bruno Berselli_, May 10 2011
%H A186682 Eric Weisstein's World of Mathematics, <a href="https://mathworld.wolfram.com/WaringsProblem.html">Waring's Problem.</a>
%H A186682 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1).
%F A186682 G.f.: x^2*(2+17*x+5*x^2)/(1-x). - _Bruno Berselli_, May 10 2011
%t A186682 PadRight[{0, 2, 19}, 100, 24] (* _Paolo Xausa_, Jul 30 2024 *)
%Y A186682 Cf. A046049.
%K A186682 nonn,easy
%O A186682 1,2
%A A186682 _Martin Renner_, Feb 25 2011
%E A186682 a(5)-a(6) from _Lars Blomberg_, May 08 2011
%E A186682 a(7) from _Charles R Greathouse IV_, May 08 2011
%E A186682 Terms after a(7) from _Nathaniel Johnston_, May 09 2011