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 A333821 #13 May 16 2020 02:25:16
%S A333821 6,18,36,48,60,90,126,144,162,168,210,216,252,270,288,330,360,378,384,
%T A333821 396,468,480,486,540,546,594,630,720,750,792,816,858,918,924,972,990,
%U A333821 1008,1026,1140,1152,1170,1260,1296,1344,1386,1404,1518,1530,1560,1620,1638,1656,1680,1728,1800
%N A333821 Numbers k that can be represented in the form k = p^3 - q^3 - r^3, where p, q, r are positive integers satisfying p = q + r.
%C A333821 An alternative representation of k is k = 3*q*r*(q+r), with q, r positive integers, then k is a multiple of 6.
%F A333821 a(n) = 6 * A121741(n).
%e A333821 60 is in the sequence because 60 = 5^3 - 4^3 - 1^3, with 5 = 4 + 1.
%o A333821 (PARI) ok(n) = {my(i=1, a=0, m=0, j); if(n%6==0, while(a<=n&&m==0, j=1; while(j<i&&m==0, a=3*i*j*(i-j); if(a==n, m=1); j+=1); i+=1)); m}
%Y A333821 Cf. A000578, A003072, A024975, A078129, A255018, A275154.
%K A333821 nonn
%O A333821 1,1
%A A333821 _Antonio Roldán_, Apr 06 2020