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 A013746 #27 Jul 08 2025 10:00:39 %S A013746 10,10000,10000000,10000000000,10000000000000,10000000000000000, %T A013746 10000000000000000000,10000000000000000000000, %U A013746 10000000000000000000000000,10000000000000000000000000000,10000000000000000000000000000000,10000000000000000000000000000000000 %N A013746 a(n) = 10^(3*n + 1). %H A013746 Vincenzo Librandi, <a href="/A013746/b013746.txt">Table of n, a(n) for n = 0..100</a> %H A013746 Tanya Khovanova, <a href="http://www.tanyakhovanova.com/RecursiveSequences/RecursiveSequences.html">Recursive Sequences</a>. %H A013746 <a href="/index/Rec#order_01">Index entries for linear recurrences with constant coefficients</a>, signature (1000). %F A013746 From _Philippe Deléham_, Nov 30 2008: (Start) %F A013746 a(n) = 1000*a(n-1); a(0)=10. %F A013746 G.f.: 10/(1-1000*x). (End) %F A013746 From _Elmo R. Oliveira_, Jul 07 2025: (Start) %F A013746 E.g.f.: 10*exp(1000*x). %F A013746 a(n) = A013747(n)/10 = A013730(n)*A013736(n) = A011557(A016777(n)). (End) %t A013746 10^(3Range[0,10]+1) (* _Harvey P. Dale_, Mar 28 2011 *) %o A013746 (Magma) [10^(3*n+1): n in [0..15]]; // _Vincenzo Librandi_, Jun 26 2011 %o A013746 (PARI) a(n)=10^(3*n+1) \\ _Charles R Greathouse IV_, Jul 11 2016 %Y A013746 Subsequence of A011557 (10^n). %Y A013746 Cf. A013730, A013736, A013747, A016777. %K A013746 nonn,easy %O A013746 0,1 %A A013746 _N. J. A. Sloane_