Numbers whose sum of prime factors (taken with multiplicity) is even.

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =9a(5) =15a(6) =16a(7) =18a(8) =21a(9) =25a(10) =30a(11) =32a(12) =33a(13) =35a(14) =36a(15) =39a(16) =42a(17) =49a(18) =50a(19) =51a(20) =55a(21) =57a(22) =60a(23) =64a(24) =65a(25) =66a(26) =69a(27) =70a(28) =72a(29) =77