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

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

Offset

1,1

Comments

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

Links

Table of n, a(n) for n=1..11.

Example

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).

Sequence in context: A177061 A020994 A085823 * A211682 A100552 A210566

Adjacent sequences: A284057 A284058 A284059 * A284061 A284062 A284063

Keyword

nonn,base,fini,full

Author

Rick L. Shepherd, Mar 19 2017

Status

approved