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 A066004 #19 Dec 04 2024 15:39:56
%S A066004 1,8,10,8,19,26,19,26,37,35,37,62,64,71,46,62,73,80,82,80,82,89,109,
%T A066004 89,109,125,100,107,118,107,118,125,127,107,118,125,145,143,145,152,
%U A066004 172,170,172,188,181,170,190,215,172,215,235,233,217,215
%N A066004 Sum of digits of 8^n.
%H A066004 Harry J. Smith, <a href="/A066004/b066004.txt">Table of n, a(n) for n = 0..1000</a>
%F A066004 a(n) = A007953(A001018(n)). - _Michel Marcus_, Nov 01 2013
%t A066004 Table[Total[IntegerDigits[8^n]], {n, 0, 60}] (* _Vincenzo Librandi_, Oct 08 2013 *)
%o A066004 (PARI) a(n) = sumdigits(8^n); \\ _Michel Marcus_, Nov 01 2013
%Y A066004 Cf. sum of digits of k^n: A001370 (k=2), A004166 (k=3), A065713 (k=4), A066001 (k=5), A066002 (k=6), A066003(k=7), this sequence (k=8), A065999 (k=9), A066005 (k=11), A066006 (k=12), A175527 (k=13).
%K A066004 nonn,base
%O A066004 0,2
%A A066004 _N. J. A. Sloane_, Dec 11 2001