A091428 Numbers k such that abs(A092673(k)) = 1.

1, 3, 4, 5, 7, 11, 12, 13, 15, 17, 19, 20, 21, 23, 28, 29, 31, 33, 35, 37, 39, 41, 43, 44, 47, 51, 52, 53, 55, 57, 59, 60, 61, 65, 67, 68, 69, 71, 73, 76, 77, 79, 83, 84, 85, 87, 89, 91, 92, 93, 95, 97, 101, 103, 105, 107, 109, 111, 113, 115, 116, 119, 123, 124, 127, 129

Offset: 1

Author

Jon Perry, Mar 02 2004

Keywords

• nonn

Comments

The asymptotic density of this sequence is 5/Pi^2 = 0.506605... . - Amiram Eldar, Jan 11 2023

Links

• Amiram Eldar, Table of n, a(n) for n = 1..10000

Crossrefs

Disjoint union of A056911 and A081770.

Cf. A092673, A359592 (characteristic function).

Distinct from A020486.

Programs

Mathematica

Select[Range[130], Abs[MoebiusMu[#] - If[EvenQ[#], MoebiusMu[#/2], 0]] == 1 &] (* Amiram Eldar, Jan 11 2023 *)