A032718 n prefixed by '1' and followed by '7' is a prime.

0, 2, 3, 5, 6, 9, 11, 18, 21, 23, 27, 29, 30, 32, 36, 42, 44, 48, 56, 59, 60, 62, 63, 65, 66, 69, 74, 77, 78, 84, 86, 87, 90, 98, 99, 102, 104, 105, 108, 111, 117, 119, 125, 128, 131, 143, 144, 146, 149, 152, 158, 159, 161, 165, 167, 171, 177, 180, 182, 186