A374108 Numbers k such that A113177(k) and A328845(k) are both even, where A113177 is fully additive with a(p) = Fibonacci(p) and A328845 is the first Fibonacci-based variant of the arithmetic derivative.

1, 3, 4, 9, 12, 16, 25, 27, 35, 36, 40, 48, 49, 55, 56, 64, 65, 75, 77, 81, 85, 88, 91, 95, 100, 104, 105, 108, 115, 119, 120, 121, 133, 136, 140, 143, 144, 145, 147, 152, 155, 160, 161, 165, 168, 169, 184, 185, 187, 192, 195, 196, 203, 205, 209, 215, 217, 220, 221, 224, 225, 231, 232, 235, 243, 247, 248, 253, 255, 256

Offset: 1

Author

Antti Karttunen, Jun 29 2024

Keywords

• nonn

Comments

A multiplicative semigroup: if m and n are in the sequence, then so is m*n.

Links

• Antti Karttunen, Table of n, a(n) for n = 1..12000

Crossrefs

Cf. A113177, A328845, A374107 (characteristic function), A374109 (complement).

Indices of even terms in A374106.

Intersection of A373586 and A374046.

Programs

PARI

isA374108 = A374107;