A364566 Numbers k such that A364557(k) < A000010(k), where A364557 is the Möbius transform of A005941, and A000010 is Euler totient function phi.

9, 15, 18, 21, 25, 27, 30, 33, 35, 36, 42, 45, 49, 50, 54, 55, 60, 63, 65, 66, 70, 72, 75, 77, 81, 84, 90, 91, 98, 99, 100, 105, 108, 110, 117, 119, 120, 121, 125, 126, 130, 132, 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

Offset

1,1

Links

Table of n, a(n) for n=1..69.

Prog

(PARI)
A364557(n) = if(1==n, 1, 2^(primepi(vecmax(factor(n)[, 1]))+(bigomega(n)-omega(n))-1));
isA364566(n) = (A364557(n)<eulerphi(n));

Crossrefs

Positions of negative terms in A364558.

Cf. A000010, A364557, A364565.

Sequence in context: A105441 A325164 A093642 * A177733 A207675 A118236

Adjacent sequences: A364563 A364564 A364565 * A364567 A364568 A364569

Keyword

nonn

Author

Antti Karttunen, Jul 29 2023

Status

approved