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

1,3

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

Prog

(PARI) isA374037 = A374036;

Crossrefs

Intersection of A374046 and A374049.

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

Sequence in context: A371601 A283050 A069168 * A102211 A244032 A321454

Adjacent sequences: A374034 A374035 A374036 * A374038 A374039 A374040

Keyword

nonn

Author

Antti Karttunen, Jun 28 2024

Status

approved