A050126 a(n) = n-th number k such that b(k)<b(k+1), where b=A050124.

1, 2, 3, 4, 6, 7, 8, 9, 11, 12, 14, 15, 17, 18, 19, 20, 21, 23, 24, 26, 27, 28, 29, 30, 31, 33, 34, 37, 38, 39, 41, 42, 43, 45, 46, 48, 50, 51, 52, 55, 56, 57, 58, 59, 61, 63, 64, 65, 66, 69, 70, 71, 72, 74, 75, 77, 78, 79, 80, 82, 83, 86