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 A066921 #26 May 07 2025 03:04:46
%S A066921 0,1,1,2,1,2,1,3,2,2,1,6,1,2,2,4,1,6,1,6,2,2,1,4,2,2,3,6,1,3,1,5,2,2,
%T A066921 2,4,1,2,2,4,1,3,1,6,6,2,1,10,2,6,2,6,1,4,2,4,2,2,1,12,1,2,6,6,2,3,1,
%U A066921 6,2,3,1,10,1,2,6,6,2,3,1,10,4,2,1,12,2,2,2,4,1,12,2,6,2,2,2,6,1,6,6,4,1,3
%N A066921 a(n) = lcm(Omega(n), omega(n)).
%H A066921 Harry J. Smith, <a href="/A066921/b066921.txt">Table of n, a(n) for n = 1..1000</a>
%F A066921 a(n) = A113901(n)/A066922(n). - _Amiram Eldar_, May 07 2025
%e A066921 a(32) = 5 because Omega(32) = 5, omega(32) = 1, and lcm(5, 1) = 5.
%e A066921 a(33) = 2 because Omega(33) = 2, omega(33) = 2.
%t A066921 Table[LCM[PrimeOmega[n], PrimeNu[n]], {n, 100}] (* _Alonso del Arte_, Dec 25 2015 *)
%o A066921 (PARI) a(n) = { lcm(bigomega(n),omega(n)) } \\ _Harry J. Smith_, Apr 06 2010
%Y A066921 Cf. A001221 (omega), A001222 (Omega), A066922, A113901.
%K A066921 nonn,easy
%O A066921 1,4
%A A066921 _Benoit Cloitre_, Jan 23 2002