A359771 - OEIS

%I #5 Jan 15 2023 15:09:46

%S 1,2,8,9,12,15,18,20,21,25,28,30,32,33,35,39,42,44,48,49,50,51,52,55,

%T 57,65,66,68,69,70,72,76,77,78,80,81,85,87,91,92,93,95,98,102,108,110,

%U 111,112,114,115,116,119,120,121,123,124,128,129,130,133,135,138,141,143,145,148,154,155,159,161

%N 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.

%o (PARI) isA359771(n) = A359770(n);

%Y Union of A046337 and A046470.

%Y Positions of odd terms in A069345.

%Y Cf. A001222, A359770 (characteristic function), A359772 (complement).

%K nonn

%O 1,2

%A _Antti Karttunen_, Jan 15 2023