A373487 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.

1, 2, 3, 5, 7, 10, 11, 13, 15, 17, 19, 23, 28, 29, 31, 35, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 91, 97, 101, 103, 107, 109, 113, 127, 131, 137, 139, 143, 149, 151, 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

Offset: 1

Author

Antti Karttunen, Jun 09 2024

Keywords

• nonn

Links

• Antti Karttunen, Table of n, a(n) for n = 1..10000

Crossrefs

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

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

Disjoint union of A000040 and A373488 (nonprime terms).

Cf. also A373489.

Programs

PARI

isA373487 = A373486;