A343715 Palindromic primes of the form p//q//reverse(p), where p, q, and reverse(p) are primes.

353, 373, 727, 757, 11311, 13331, 31013, 31513, 33533, 37273, 37573, 39293, 71317, 71917, 73237, 77977, 79397, 97379, 97579, 1175711, 1178711, 1317131, 1335331, 1338331, 1513151, 1572751, 1737371, 1793971, 1917191, 1993991, 1995991, 3103013, 3106013, 3127213

Offset

1,1

Comments

If reverse(p) were allowed to be nonprime, the result would be sequence A343714, which includes such terms as 19391.

Links

Table of n, a(n) for n=1..34.

Example

353 is a term because it is a palindromic prime (A002385) and is the concatenation of 3 (a prime), 5 (a palindromic prime), and 3 (the reverse of 3, and also a prime).
31513 is a term in two ways: as the concatenation 3//151//3 and as the concatenation 31//5//13.
7392937 is a term in three ways: 7//39293//7, 73//929//37, and 739//2//937.

Crossrefs

Cf. A002385, A045336, A177678, A343714.

Sequence in context: A245440 A145023 A343714 * A177678 A058375 A059635

Adjacent sequences: A343712 A343713 A343714 * A343716 A343717 A343718

Keyword

nonn,base

Author

Jon E. Schoenfield, May 08 2021

Status

approved