A367018 Composite squarefree k that are not divisible by 6.

10, 14, 15, 21, 22, 26, 33, 34, 35, 38, 39, 46, 51, 55, 57, 58, 62, 65, 69, 70, 74, 77, 82, 85, 86, 87, 91, 93, 94, 95, 105, 106, 110, 111, 115, 118, 119, 122, 123, 129, 130, 133, 134, 141, 142, 143, 145, 146, 154, 155, 158, 159, 161, 165, 166, 170, 177, 178, 182

Offset: 1

Author

Michael De Vlieger, Jan 15 2024

Keywords

• nonn
• easy

Comments

The asymptotic density of this sequence is 1/(2*Pi^2). - Amiram Eldar, Jan 20 2024

Examples

			70 is in this sequence since it is composite and squarefree but not divisible by 6. It does not appear in A006881 since it is the product of 3 primes.
		

Links

• Michael De Vlieger, Table of n, a(n) for n = 1..10000

Crossrefs

Cf. A047253, A120944, A367455.

Programs

Mathematica

Select[Range[180], And[SquareFreeQ[#], CompositeQ[#], Mod[#, 6] != 0] &]

Formula

Intersection of A047253 and A120944 = { k : Omega(k) > omega(k) = 1, k mod 6 != 0 }.