A026415 a(n) = n-th number k such that s(k) is odd, where s = A026409.

1, 3, 6, 7, 9, 11, 12, 16, 17, 19, 22, 24, 25, 26, 27, 32, 33, 35, 36, 38, 41, 44, 45, 48, 49, 50, 53, 54, 55, 58, 60, 61, 62, 67, 70, 71, 74, 75, 76, 80, 84, 85