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A359163
Numbers of the form 4u+3 with an even number of prime factors (counted with multiplicity).
4
15, 35, 39, 51, 55, 87, 91, 95, 111, 115, 119, 123, 135, 143, 155, 159, 183, 187, 203, 215, 219, 235, 247, 259, 267, 287, 291, 295, 299, 303, 315, 319, 323, 327, 335, 339, 351, 355, 371, 375, 391, 395, 403, 407, 411, 415, 427, 447, 451, 459, 471, 495, 511, 515, 519, 527, 535, 543, 551, 559, 579, 583
OFFSET
1,1
EXAMPLE
135 = 3 * 3 * 3 * 5 has an even number of prime factors and is of the form 4u+3, therefore 135 is included in this sequence.
PROG
(PARI) isA359163(n) = A359162(n);
CROSSREFS
Intersection of A004767 and A028260.
Setwise difference A004767 \ A359153.
Setwise difference A046337 \ A359161.
Cf. A359162 (characteristic function).
Cf. A080774 (subsequence).
Sequence in context: A154988 A345331 A360110 * A327934 A202237 A080774
KEYWORD
nonn
AUTHOR
Antti Karttunen, Dec 17 2022
STATUS
approved