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 A294577 #17 Nov 01 2019 22:20:42 %S A294577 81,89,101,125,129,134,149,161,162,170,171,173,189,198,201,233,241, %T A294577 242,243,245,246,249,250,251,254,270,274,278,285,289,294,299,324,339, %U A294577 349,356,361,363,370,371,378,387,390,393,395,404,406,411,417,429,433,451 %N A294577 Numbers that are the sum of three squares (square 0 allowed) in exactly four ways. %C A294577 These are the numbers for which A000164(a(n)) = 4. %C A294577 a(n) is the n-th largest number which has a representation as a sum of three integer squares (square 0 allowed), in exactly four ways, if neither the order of terms nor the signs of the numbers to be squared are taken into account. The multiplicity of a(n) with order and signs taken into account is A005875(a(n)). %C A294577 This sequence is a proper subsequence of A000378. %H A294577 Robert Price, <a href="/A294577/b294577.txt">Table of n, a(n) for n = 1..1030</a> %t A294577 Select[Range[0, 1000], Length[PowersRepresentations[#, 3, 2]] == 4 &] %Y A294577 Cf. A000164, A005875, A000378, A094942, A224442, A224443. %K A294577 nonn %O A294577 1,1 %A A294577 _Robert Price_, Nov 02 2017 %E A294577 Updated Mathematica program to Version 11. by _Robert Price_, Nov 01 2019