A373265 Numbers k such that k' / gcd(k,k') is of the form 4m+2, where k' stands for the arithmetic derivative of k, A003415.

9, 16, 20, 21, 25, 33, 49, 52, 57, 65, 68, 69, 77, 85, 93, 108, 116, 121, 129, 133, 135, 141, 145, 148, 161, 164, 169, 177, 185, 192, 201, 205, 209, 212, 213, 217, 221, 237, 240, 244, 249, 252, 253, 265, 289, 292, 300, 301, 305, 309, 315, 321, 329, 341, 351, 356, 361, 365, 375, 377, 381, 388, 393, 396, 404, 413, 417

Offset

1,1

Links

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

Prog

(PARI) isA373265 = A373264;

Crossrefs

Setwise difference A369002 \ A369005.

Cf. A003415, A083345, A373264 (characteristic function).

Sequence in context: A048279 A250656 A072836 * A068824 A095961 A356295

Adjacent sequences: A373262 A373263 A373264 * A373266 A373267 A373268

Keyword

nonn

Author

Antti Karttunen, Jun 01 2024

Status

approved