login
A373257
Numbers k for which A003415(k) == -1 (mod 3), where A003415 is the arithmetic derivative.
3
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
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
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jun 01 2024
STATUS
approved