A052039 n equals the first significant digits of 1/a(n).

1, 4, 3, 21, 2, 15, 13, 12, 11, 91, 9, 8, 72, 7, 63, 6, 56, 53, 51, 48, 46, 44, 42, 41, 4, 38, 36, 35, 34, 33, 32, 31, 3, 29, 28, 271, 27, 26, 251, 244, 24, 233, 23, 223, 22, 213, 21, 205, 201, 197, 193, 19, 186, 182, 18, 176, 173, 17, 167, 164, 162, 16, 157, 154, 152