A374037 Numbers k such that A328845(k) and A328846(k) are both even, where A328845 and A328846 are the first and second Fibonacci-based variants of the arithmetic derivative.

0, 1, 4, 8, 9, 12, 16, 20, 24, 25, 28, 32, 36, 40, 44, 48, 49, 52, 55, 56, 60, 64, 65, 68, 72, 76, 80, 81, 84, 88, 92, 95, 96, 100, 104, 105, 108, 112, 115, 116, 119, 120, 121, 124, 128, 132, 136, 140, 143, 144, 148, 152, 155, 156, 160, 164, 168, 169, 172, 176, 180, 184, 185, 188, 192, 196, 200, 203, 204, 208, 209

Offset: 1

Author

Antti Karttunen, Jun 28 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
• Index entries for sequences related to prime indices in the factorization of n

Crossrefs

Intersection of A374046 and A374049.

Cf. A328845, A328846, A374036 (characteristic function), A374038 (complement).

Programs

PARI

isA374037 = A374036;