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 A364566 #4 Jul 29 2023 15:59:00 %S A364566 9,15,18,21,25,27,30,33,35,36,42,45,49,50,54,55,60,63,65,66,70,72,75, %T A364566 77,81,84,90,91,98,99,100,105,108,110,117,119,120,121,125,126,130,132, %U A364566 135,140,143,144,147,150,154,162,165,168,169,175,180,182,187,189,195,196,198,200,209,210,216,220,221,225,231 %N A364566 Numbers k such that A364557(k) < A000010(k), where A364557 is the Möbius transform of A005941, and A000010 is Euler totient function phi. %o A364566 (PARI) %o A364566 A364557(n) = if(1==n, 1, 2^(primepi(vecmax(factor(n)[, 1]))+(bigomega(n)-omega(n))-1)); %o A364566 isA364566(n) = (A364557(n)<eulerphi(n)); %Y A364566 Positions of negative terms in A364558. %Y A364566 Cf. A000010, A364557, A364565. %K A364566 nonn %O A364566 1,1 %A A364566 _Antti Karttunen_, Jul 29 2023