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 A067508 #9 Sep 17 2024 19:11:37
%S A067508 4,67108864,68719476736,1125899906842624,18446744073709551616,
%T A067508 302231454903657293676544,1208925819614629174706176,
%U A067508 4835703278458516698824704,77371252455336267181195264,316912650057057350374175801344,5192296858534827628530496329220096
%N A067508 Powers of 4 with digit sum divisible by 4.
%H A067508 Andrew Howroyd, <a href="/A067508/b067508.txt">Table of n, a(n) for n = 1..200</a>
%o A067508 (PARI) lista(n)={my(L=List(),k=0);while(#L<n, if(sumdigits(4^k)%4==0, listput(L,4^k)); k++); Vec(L)} \\ _Andrew Howroyd_, Sep 17 2024
%Y A067508 Intersection of A000302 and A268620.
%Y A067508 Cf. A067499, A067500, A067501, A067502, A067503, A067504, A067505, A067506, A067507.
%K A067508 base,easy,nonn
%O A067508 1,1
%A A067508 _Amarnath Murthy_, Feb 11 2002
%E A067508 More terms from _Sascha Kurz_, Mar 18 2002
%E A067508 Offset changed and a(10) onwards from _Andrew Howroyd_, Sep 17 2024