A032689 Numbers k such that k surrounded by digit '7' is a lucky number.
1, 2, 7, 8, 16, 19, 20, 23, 35, 37, 43, 44, 50, 56, 67, 68, 71, 73, 82, 83, 89, 91, 94, 101, 103, 104, 115, 127, 134, 151, 154, 155, 157, 161, 169, 199, 212, 215, 218, 227, 232, 257, 260, 268, 272, 278, 289, 290, 299, 301, 308, 311, 317, 319, 322, 337, 338
Offset: 1