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

1,1

Links

Table of n, a(n) for n=1..69.

Prog

(PARI) isA373257 = A373256;

Crossrefs

Cf. A003415, A373256 (characteristic function).

Positions of -1's in A373253.

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

Sequence in context: A358760 A114812 A158338 * A351472 A139204 A122661

Adjacent sequences: A373254 A373255 A373256 * A373258 A373259 A373260

Keyword

nonn

Author

Antti Karttunen, Jun 01 2024

Status

approved