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 A013835 #24 Sep 08 2022 08:44:38 %S A013835 25,78125,244140625,762939453125,2384185791015625,7450580596923828125, %T A013835 23283064365386962890625,72759576141834259033203125, %U A013835 227373675443232059478759765625,710542735760100185871124267578125,2220446049250313080847263336181640625 %N A013835 a(n) = 5^(5*n + 2). %H A013835 Vincenzo Librandi, <a href="/A013835/b013835.txt">Table of n, a(n) for n = 0..100</a> %H A013835 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A013835 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (3125). %F A013835 From _Philippe Deléham_, Dec 03 2008: (Start) %F A013835 a(n) = 3125*a(n-1); a(0)=25. %F A013835 G.f.: 25/(1-3125*x). (End) %t A013835 5^(5*Range[0,20]+2) (* or *) NestList[3125#&,25,20] (* _Harvey P. Dale_, Jan 02 2019 *) %o A013835 (Magma) [5^(5*n+2): n in [0..15]]; // _Vincenzo Librandi_, Jul 07 2011 %o A013835 (Maxima) makelist(5^(5*n+2),n,0,20); /* _Martin Ettl_, Oct 21 2012 */ %o A013835 (PARI) a(n)=5^(5*n+2) \\ _Charles R Greathouse IV_, Jul 11 2016 %K A013835 nonn,easy %O A013835 0,1 %A A013835 _N. J. A. Sloane_