A373487 - OEIS

%I #6 Jun 09 2024 15:31:32

%S 1,2,3,5,7,10,11,13,15,17,19,23,28,29,31,35,37,41,43,47,53,59,61,67,

%T 71,73,79,83,89,91,97,101,103,107,109,113,127,131,137,139,143,149,151,

%U 155,157,161,163,167,173,179,181,187,191,193,197,199,203,209,211,215,221,223,227,229,233,239,241,251,257,263

%N Numbers k such that A276085(k) is a multiple of A003415(k), where A003415 is the arithmetic derivative and A276085 is the primorial base log-function.

%H Antti Karttunen, <a href="/A373487/b373487.txt">Table of n, a(n) for n = 1..10000</a>

%o (PARI) isA373487 = A373486;

%Y Cf. A003415, A276085, A369650 (subsequence), A373486 (characteristic function).

%Y After the initial 1, gives the positions of 0's in A373148.

%Y Disjoint union of A000040 and A373488 (nonprime terms).

%Y Cf. also A373489.

%K nonn

%O 1,2

%A _Antti Karttunen_, Jun 09 2024