A374122 - OEIS

%I #6 Jun 28 2024 21:11:02

%S 0,1,8,9,10,14,18,22,27,36,45,52,54,58,62,63,64,65,68,72,76,80,81,85,

%T 90,91,92,95,99,100,106,108,112,115,117,118,119,125,126,133,135,140,

%U 143,144,146,148,153,158,161,162,164,166,171,172,175,176,180,185,187,188,189,194,196,198,202,205,206,207,209,214,215

%N Numbers k for which A328845(k) is a multiple of 3, where A328845 is the first Fibonacci-based variant of the arithmetic derivative.

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

%H Antti Karttunen, <a href="/A374122/b374122.txt">Table of n, a(n) for n = 1..12000</a>

%o (PARI) isA374122 = A374121;

%Y Cf. A328845, A374121 (characteristic function).

%Y Cf. also A374046, A374052.

%K nonn

%O 1,3

%A _Antti Karttunen_, Jun 28 2024