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 A169827 #14 Apr 16 2024 09:50:21 %S A169827 0,840,1680,2520,3360,4200,5040,5880,6720,7560,8400,9240,10080,10920, %T A169827 11760,12600,13440,14280,15120,15960,16800,17640,18480,19320,20160, %U A169827 21000,21840,22680,23520,24360,25200,26040,26880,27720,28560,29400,30240,31080,31920 %N A169827 Multiples of 840. %C A169827 Numbers that are divisible by all of 1,2,3,4,5,6,7,8. %H A169827 Erich Friedman, <a href="https://erich-friedman.github.io/numbers.html">What's Special About This Number?</a> %H A169827 <a href="/index/Rec#order_02">Index entries for linear recurrences with constant coefficients</a>, signature (2,-1). %F A169827 From _Elmo R. Oliveira_, Apr 16 2024: (Start) %F A169827 G.f.: 840*x/(x-1)^2. %F A169827 E.g.f.: 840*x*exp(x). %F A169827 a(n) = 840*n = 2*a(n-1) - a(n-2) for n >= 2. %F A169827 a(n) = 2*A169825(n) = 14*A169823(n) = 21*A317095(n) = 28*A249674(n) = 30*A135628(n) = 40*A008603(n) = 60*A008596(n) = 420*A005843(n) = 840*A001477(n). (End) %t A169827 840*Range[0,40] (* _Harvey P. Dale_, Nov 03 2015 *) %o A169827 (PARI) a(n)=840*n \\ _Charles R Greathouse IV_, Apr 16 2024 %Y A169827 Cf. A001477, A005843, A008596, A008603, A135628, A169823, A169825. %Y A169827 Cf. A249674, A317095. %K A169827 nonn,easy %O A169827 0,2 %A A169827 _N. J. A. Sloane_, May 30 2010