A032712 n prefixed by '4' and followed by '3' is a prime.

3, 4, 6, 13, 15, 24, 25, 27, 28, 36, 37, 42, 46, 48, 49, 51, 52, 58, 60, 64, 66, 67, 70, 72, 73, 78, 79, 81, 90, 93, 94, 97, 99, 102, 111, 114, 118, 120, 121, 123, 124, 126, 133, 141, 144, 145, 151, 154, 159, 160, 181, 184, 186, 189, 190, 195, 198, 201, 202