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 A013836 #25 Jan 14 2025 10:55:34 %S A013836 125,390625,1220703125,3814697265625,11920928955078125, %T A013836 37252902984619140625,116415321826934814453125, %U A013836 363797880709171295166015625,1136868377216160297393798828125,3552713678800500929355621337890625 %N A013836 a(n) = 5^(5*n + 3). %H A013836 Vincenzo Librandi, <a href="/A013836/b013836.txt">Table of n, a(n) for n = 0..100</a> %H A013836 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A013836 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (3125). %F A013836 From _Philippe Deléham_, Dec 03 2008: (Start) %F A013836 a(n) = 3125*a(n-1), n > 0; a(0)=125. %F A013836 G.f.: 125/(1-3125*x). (End) %t A013836 NestList[3125#&,125, 20] (* _Harvey P. Dale_, Jan 14 2025 *) %o A013836 (Magma) [5^(5*n+3): n in [0..15]]; // _Vincenzo Librandi_, Jul 07 2011 %o A013836 (PARI) a(n)=5^(5*n+3) \\ _Edward Jiang_, Sep 06 2014 %Y A013836 Cf. A000351 (5^n), A016885 (5*n+3). %K A013836 nonn,easy %O A013836 0,1 %A A013836 _N. J. A. Sloane_