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A373589
Numbers whose number of prime factors (with multiplicity) is a multiple of 3, and all of them are of the type 3m-1 (in A003627).
6
1, 8, 20, 44, 50, 64, 68, 92, 110, 116, 125, 160, 164, 170, 188, 212, 230, 236, 242, 275, 284, 290, 332, 352, 356, 374, 400, 404, 410, 425, 428, 452, 470, 506, 512, 524, 530, 544, 548, 575, 578, 590, 596, 605, 638, 668, 692, 710, 716, 725, 736, 764, 782, 788, 830, 880, 890, 902, 908, 928, 932, 935, 956, 986, 1000
OFFSET
1,2
COMMENTS
A multiplicative semigroup: if m and n are in the sequence, then so is m*n.
LINKS
PROG
(PARI) isA373589 = A373588;
CROSSREFS
Cf. A001222, A003627, A121307 (subsequence), A373588 (characteristic function).
Intersection of A004612 and A145784.
Subsequence of A373597, which in turn is a subsequence of many other sequences.
Cf. also A373590.
Sequence in context: A192753 A373492 A373597 * A121307 A338471 A086169
KEYWORD
nonn,easy
AUTHOR
Antti Karttunen, Jun 10 2024
STATUS
approved