A373257 Numbers k for which A003415(k) == -1 (mod 3), where A003415 is the arithmetic derivative.

6, 15, 16, 24, 28, 32, 33, 40, 42, 49, 51, 52, 56, 60, 69, 70, 76, 78, 80, 87, 88, 91, 96, 98, 100, 104, 105, 114, 123, 124, 130, 132, 133, 136, 140, 141, 148, 150, 152, 154, 159, 168, 169, 172, 175, 176, 177, 182, 184, 186, 190, 195, 200, 204, 213, 217, 220, 222, 231, 232, 238, 240, 244, 245, 247, 248, 249, 250, 258

Offset: 1

Author

Antti Karttunen, Jun 01 2024

Keywords

• nonn

Crossrefs

Cf. A003415, A373256 (characteristic function).

Positions of -1's in A373253.

Nonnegative integers are partitioned between A327863, A373255, and this sequence.

Programs

PARI

isA373257 = A373256;