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 A067511 #10 Sep 17 2024 19:07:39
%S A067511 7,2401,117649,40353607,1977326743,9387480337647754305649,
%T A067511 65712362363534280139543,459986536544739960976801,
%U A067511 15286700631942576193765185769276826401,5243338316756303634461458718861951455543,12589255298531885026341962383987545444758743
%N A067511 Powers of 7 with digit sum divisible by 7.
%H A067511 Andrew Howroyd, <a href="/A067511/b067511.txt">Table of n, a(n) for n = 1..150</a>
%o A067511 (PARI) lista(n)={my(L=List(),k=0);while(#L<n, if(sumdigits(7^k)%7==0, listput(L,7^k)); k++); Vec(L)} \\ _Andrew Howroyd_, Sep 17 2024
%Y A067511 Intersection of A000420 and A273159.
%Y A067511 Cf. A067499, A067500, A067501, A067502, A067503, A067504, A067505, A067506, A067507, A067508, A067509, A067510.
%K A067511 base,easy,nonn
%O A067511 1,1
%A A067511 _Amarnath Murthy_, Feb 11 2002
%E A067511 More terms from _Sascha Kurz_, Mar 18 2002
%E A067511 Offset changed and a(10) onwards from _Andrew Howroyd_, Sep 17 2024