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 A009230 #20 Oct 27 2023 19:28:08
%S A009230 1,2,6,12,10,12,14,8,9,20,22,12,26,28,60,80,34,18,38,60,84,44,46,24,
%T A009230 75,52,108,84,58,120,62,96,132,68,140,36,74,76,156,40,82,168,86,132,
%U A009230 90,92,94,240,147,150,204,156,106,216,220,56,228,116,118,60,122,124,126,448
%N A009230 a(n) = lcm(n, d(n)).
%C A009230 Fixed points of this sequence are the refactorable numbers (A033950), i.e. a(A033950(n)) = A033950(n). - _Labos Elemer_, Nov 18 2002
%H A009230 Alois P. Heinz, <a href="/A009230/b009230.txt">Table of n, a(n) for n = 1..20000</a> (first 1000 terms from T. D. Noe)
%p A009230 a:= n-> ilcm(n, numtheory[tau](n)):
%p A009230 seq(a(n), n=1..100); # _Alois P. Heinz_, Jan 14 2017
%t A009230 Table[LCM[n,DivisorSigma[0,n]],{n,70}] (* _Harvey P. Dale_, Jul 31 2016 *)
%Y A009230 Cf. A000005, A033950.
%K A009230 nonn
%O A009230 1,2
%A A009230 _David W. Wilson_