Numbers k such that A026409(k) is odd.

Terms

a(0) =1a(1) =3a(2) =6a(3) =7a(4) =9a(5) =11a(6) =12a(7) =16a(8) =17a(9) =19a(10) =22a(11) =24a(12) =25a(13) =26a(14) =27a(15) =32a(16) =33a(17) =35a(18) =36a(19) =38a(20) =41a(21) =44a(22) =45a(23) =48a(24) =49a(25) =50a(26) =53a(27) =54a(28) =55a(29) =58