A284060 Primes that are left-, left/right-, and right-truncatable.

2, 3, 5, 7, 23, 37, 53, 73, 373, 3137, 3797

Offset: 1

Author

Rick L. Shepherd, Mar 19 2017

Keywords

• nonn
• base
• fini
• full

Comments

Intersection of A020994 and A077390. Only the last three terms exhibit all three properties nontrivially.

Examples

			The prime 3797 is a term because it is a term of A024785 (truncating from the left: 797, 97, 7 are primes), of A077390 (truncating the same number of digits from left and from right: 79 is a prime), and of A024770 (truncating from the right: 379, 37, 3 are primes). The digit 9 is not a prime, so 3797 is not also a term of A085823.
		

Crossrefs

Cf. A020994, A024770, A024785, A077390, A085823 (a subsequence).