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 A013909 #18 Sep 08 2022 08:44:38 %S A013909 279841,1801152661463,11592836324538749809,74615470927590710561908487, %T A013909 480250763996501976790165756943041, %U A013909 3091058643093537522799545838540043339063,19895113660064588580108197261066338165074766609,128051775540161094255459334683883498184411818540470887 %N A013909 a(n) = 23^(5*n + 4). %H A013909 Vincenzo Librandi, <a href="/A013909/b013909.txt">Table of n, a(n) for n = 0..50</a> %H A013909 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a> %H A013909 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (6436343). %F A013909 a(n) = 6436343*a(n-1), a(0)=279841. - _Vincenzo Librandi_, May 29 2011 %t A013909 23^(5*Range[0,10]+4) (* or *) NestList[6436343#&,279841,10] (* _Harvey P. Dale_, Jan 15 2016 *) %o A013909 (Magma) [23^(5*n+4): n in [0..10]]; // _Vincenzo Librandi_, May 29 2011 %Y A013909 Cf. A009967. %K A013909 nonn %O A013909 0,1 %A A013909 _N. J. A. Sloane_