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 A009278 #18 Jan 31 2025 03:57:25
%S A009278 1,6,4,21,6,12,8,60,39,36,12,84,14,24,24,155,18,78,20,42,32,36,24,120,
%T A009278 93,84,40,168,30,72,32,126,48,108,48,819,38,60,56,360,42,96,44,84,78,
%U A009278 72,48,620,57,186,72,294,54,120,72,120,80,180,60,168,62,96,312,889,84,144,68
%N A009278 a(n) = lcm(d(n), sigma(n)).
%H A009278 Antti Karttunen, <a href="/A009278/b009278.txt">Table of n, a(n) for n = 1..10000</a>
%F A009278 a(n) = A064840(n)/A009205(n). - _Amiram Eldar_, Jan 31 2025
%t A009278 Table[LCM[Length[Divisors[n]], DivisorSigma[1, n]], {n, 1, 100}] (* _Stefan Steinerberger_, Apr 13 2006 *)
%o A009278 (PARI) A009278(n) = lcm(numdiv(n), sigma(n)); \\ _Antti Karttunen_, Sep 10 2017
%Y A009278 Cf. A000005, A000203, A009205, A009286, A064840.
%K A009278 nonn
%O A009278 1,2
%A A009278 _David W. Wilson_