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A359771
Union of even numbers with an odd number of prime factors and odd numbers with an even number of prime factors, when the number of prime factors is counted with multiplicity.
3
1, 2, 8, 9, 12, 15, 18, 20, 21, 25, 28, 30, 32, 33, 35, 39, 42, 44, 48, 49, 50, 51, 52, 55, 57, 65, 66, 68, 69, 70, 72, 76, 77, 78, 80, 81, 85, 87, 91, 92, 93, 95, 98, 102, 108, 110, 111, 112, 114, 115, 116, 119, 120, 121, 123, 124, 128, 129, 130, 133, 135, 138, 141, 143, 145, 148, 154, 155, 159, 161
OFFSET
1,2
PROG
(PARI) isA359771(n) = A359770(n);
CROSSREFS
Union of A046337 and A046470.
Positions of odd terms in A069345.
Cf. A001222, A359770 (characteristic function), A359772 (complement).
Sequence in context: A338807 A020676 A086678 * A289146 A294374 A066550
KEYWORD
nonn
AUTHOR
Antti Karttunen, Jan 15 2023
STATUS
approved