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 A047489 #20 Nov 16 2018 22:39:58
%S A047489 1,2,3,5,7,9,10,11,13,15,17,18,19,21,23,25,26,27,29,31,33,34,35,37,39,
%T A047489 41,42,43,45,47,49,50,51,53,55,57,58,59,61,63,65,66,67,69,71,73,74,75,
%U A047489 77,79,81,82,83,85,87,89
%N A047489 Numbers that are congruent to {1, 2, 3, 5, 7} mod 8.
%C A047489 Numbers n such that A002817(n) is divisible by n. [_Bruno Berselli_, Dec 11 2013]
%H A047489 Bruno Berselli, <a href="/A047489/b047489.txt">Table of n, a(n) for n = 1..1000</a>
%H A047489 <a href="/index/Rec#order_06">Index entries for linear recurrences with constant coefficients</a>, signature (1,0,0,0,1,-1).
%F A047489 G.f.: x*(x+1)*(x^4+x^3+x^2+1)/((x-1)^2*(x^4+x^3+x^2+x+1)). [_Colin Barker_, Jun 22 2012]
%Y A047489 Cf. A002817.
%K A047489 nonn,easy
%O A047489 1,2
%A A047489 _N. J. A. Sloane_