A088288 Palindromic primes made of only two digits say a and b such that replacing a with b and vice versa one gets another prime.

131, 191, 313, 919, 113111311, 131333131, 313111313, 331333133, 11199199111, 99911911999, 1111191911111, 9999919199999, 133131131131331, 311313313313113, 777997999799777, 999779777977999, 11177771717777111

Offset

1,1

Comments

Conjecture: Sequence is finite.

Links

Table of n, a(n) for n=1..17.

Example

131 and 313 are both members. 313 is obtained by replacing a 3 with a 1 and a 1 with a 3.

Crossrefs

Sequence in context: A085414 A068686 A082807 * A142068 A350574 A141920

Adjacent sequences: A088285 A088286 A088287 * A088289 A088290 A088291

Keyword

base,nonn

Author

Amarnath Murthy, Sep 29 2003

Extensions

More terms from David Wasserman, Aug 04 2005

Status

approved