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 A135640 #19 Jul 06 2025 15:03:12
%S A135640 1,839,703921,590589719,495504774241,415728505588199,
%T A135640 348796216188498961,292640025382150628279,245524981295624377126081,
%U A135640 205995459307028852408781959,172830190358597207170968063601,145004529710863056816442205361239,121658800427414104668995010298079521
%N A135640 Powers of 839: a(n) = 839^n.
%C A135640 The prime number 839 is related with the exceptional Lie group E_8 calculation. For more information, see: A134888, A134960 and A135639.
%H A135640 Vincenzo Librandi, <a href="/A135640/b135640.txt">Table of n, a(n) for n = 0..200</a>
%H A135640 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (839).
%F A135640 a(n) = 839^n.
%F A135640 From _Elmo R. Oliveira_, Jul 05 2025: (Start)
%F A135640 G.f.: 1/(1-839*x).
%F A135640 E.g.f.: exp(839*x).
%F A135640 a(n) = 839*a(n-1). (End)
%e A135640 a(2) = 703921 because 839^2 = 839*839 = 703921.
%t A135640 Table[839^n,{n,0,20}] (* _Vincenzo Librandi_, Mar 12 2012 *)
%t A135640 NestList[839#&,1,20] (* _Harvey P. Dale_, Aug 17 2019 *)
%Y A135640 Cf. A009975, A134888, A134960, A135639.
%K A135640 nonn,easy
%O A135640 0,2
%A A135640 _Omar E. Pol_, Nov 27 2007