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 A067575 #16 Oct 23 2024 11:27:06 %S A067575 1,4,12,16,18,27,64,80,96,144,200,216,256,324,448,486,500,672,729,768, %T A067575 1008,1024,1152,1250,1512,1568,1728,2268,2352,2560,2592,3125,3402, %U A067575 3528,3888,4096,5103,5292,5488,5832,6144,6400,7938,8232 %N A067575 Numbers k that divide phi(k)*bigomega(k). %C A067575 All powers of 4 (A000302) are in the sequence. %t A067575 Select[Range[8300],Mod[EulerPhi[#]PrimeOmega[#],#]==0&] (* _Harvey P. Dale_, Oct 23 2024 *) %Y A067575 Cf. A000302, A011775. %K A067575 nonn %O A067575 1,2 %A A067575 _Benoit Cloitre_, Jan 30 2002