A050099 a(n) = n-th number k such that b(k)>b(k+1), where b=A050096.

2, 4, 6, 7, 9, 10, 13, 14, 15, 17, 18, 21, 22, 23, 25, 26, 29, 30, 31, 32, 36, 37, 38, 40, 41, 42, 44, 45, 47, 48, 50, 51, 52, 54, 56, 57, 59, 60, 62, 63, 66, 67, 68, 69, 72, 73, 74, 76, 77, 79, 80, 85, 86, 87, 88, 89, 91, 92, 93, 95, 96