%N Every prefix and suffix prime in base 5 (written in base 5).
%C Primes that are both left-truncatable and right-truncatable in base 5.
%e The prime 67 is 232 in base 5. Truncating on the left, we obtain 32 (which is 17 in base 10) and 2, both of which are prime. Truncating on the right, we obtain 23 (which is 13 in base 10) and 2 again. Therefore 232 is in the sequence.
%A _David W. Wilson_