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 A076376 #16 Dec 04 2019 10:00:24
%S A076376 3,35,105,210,1045,1485,2970,3135,6270,24871,29029,35343,39105,50065,
%T A076376 58435,64285,70686,71145,74613,78210,87087,87685,124605,137885,140335,
%U A076376 142290,149226,150195,174174,175305,176715,192855,249210,263055,300390,350610,373065
%N A076376 Numbers k such that k, 2*k and 4*k are balanced numbers (A020492).
%H A076376 Amiram Eldar, <a href="/A076376/b076376.txt">Table of n, a(n) for n = 1..10000</a> (calculated using data from Jud McCranie, terms 1..1000 from Donovan Johnson)
%t A076376 f[x_] := DivisorSigma[1, x]/EulerPhi[x] Do[s=f[n]; s1=f[2*n]; s2=f[4*n]; If[IntegerQ[s]&&IntegerQ[s1]&&IntegerQ[s2], Print[n]], {n, 1, 1000000}]
%Y A076376 Cf. A000010, A000203, A055234, A020492, A076375.
%K A076376 nonn
%O A076376 1,1
%A A076376 _Labos Elemer_, Oct 15 2002