A103705 Add 6 to each of the preceding digits, beginning with 1.

1, 7, 13, 7, 9, 13, 15, 7, 9, 7, 11, 13, 15, 13, 7, 7, 7, 9, 7, 11, 7, 9, 13, 13, 13, 15, 13, 7, 7, 13, 15, 7, 9, 7, 9, 7, 9, 7, 11, 7, 9, 13, 13, 7, 9, 7, 11, 13, 15, 13, 15, 13, 15, 13, 7, 7, 13, 15, 7, 9, 7, 9, 13, 15, 13, 7, 7, 7, 9, 7, 11, 7, 9, 7, 11, 7, 9, 7, 11, 7, 9, 13, 13, 7, 9, 7, 11