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 A109046 #31 Oct 08 2023 15:04:11
%S A109046 0,5,10,15,20,5,30,35,40,45,10,55,60,65,70,15,80,85,90,95,20,105,110,
%T A109046 115,120,25,130,135,140,145,30,155,160,165,170,35,180,185,190,195,40,
%U A109046 205,210,215,220,45,230,235,240,245,50,255,260,265,270,55,280,285,290
%N A109046 a(n) = lcm(n, 5).
%H A109046 Amiram Eldar, <a href="/A109046/b109046.txt">Table of n, a(n) for n = 0..10000</a>
%H A109046 <a href="/index/Rec#order_10">Index entries for linear recurrences with constant coefficients</a>, signature (0,0,0,0,2,0,0,0,0,-1).
%H A109046 <a href="/index/Lc#lcm">Index entries for sequences related to lcm's</a>.
%F A109046 a(n) = n*5/gcd(n, 5) = 5*n/A109009(n) = 5*A060791(n).
%F A109046 G.f.: 5*x*(x^4+x^3+3*x^2+x+1)*(x^4+x^3-x^2+x+1) / ( (x-1)^2*(x^4+x^3+x^2+x+1)^2 ). - _R. J. Mathar_, Apr 18 2011
%F A109046 Sum_{k=1..n} a(k) ~ (21/10) * n^2. - _Amiram Eldar_, Nov 26 2022
%F A109046 Sum_{n>=1} (-1)^(n+1)/a(n) = 9*log(2)/25. - _Amiram Eldar_, Sep 08 2023
%t A109046 a[n_] := LCM[n, 5]; Array[a, 60, 0] (* _Amiram Eldar_, Nov 26 2022 *)
%t A109046 LinearRecurrence[{0,0,0,0,2,0,0,0,0,-1},{0,5,10,15,20,5,30,35,40,45},60] (* _Harvey P. Dale_, Oct 08 2023 *)
%o A109046 (Sage) [lcm(n,5)for n in range(0, 59)] # _Zerinvary Lajos_, Jun 07 2009
%o A109046 (Magma) [Lcm(n,5): n in [0..100]]; // _Vincenzo Librandi_, Apr 18 2011
%Y A109046 Cf. A060791, A109009, A109042.
%K A109046 nonn,easy
%O A109046 0,2
%A A109046 _Mitch Harris_, Jun 18 2005