A050011 a(n) = n-th number k such that b(k)>b(k+1), where b=A050008.

2, 4, 5, 6, 9, 11, 12, 13, 14, 16, 17, 19, 20, 21, 22, 24, 25, 26, 28, 30, 31, 32, 34, 35, 36, 38, 41, 43, 44, 45, 46, 47, 48, 49, 51, 53, 55, 56, 57, 58, 60, 61, 62, 63, 65, 66, 68, 69, 71, 72, 73, 75, 76, 78, 79, 81, 82, 83, 84, 85, 87