Numbers whose sum of divisors is even.

Terms

a(0) =3a(1) =5a(2) =6a(3) =7a(4) =10a(5) =11a(6) =12a(7) =13a(8) =14a(9) =15a(10) =17a(11) =19a(12) =20a(13) =21a(14) =22a(15) =23a(16) =24a(17) =26a(18) =27a(19) =28a(20) =29a(21) =30a(22) =31a(23) =33a(24) =34a(25) =35a(26) =37a(27) =38a(28) =39a(29) =40