A185104 Primes with property that each swapping any pair of digits also gives a prime.

11, 13, 17, 31, 37, 71, 73, 79, 97, 113, 131, 179, 199, 311, 337, 373, 733, 919, 991, 3911

Offset: 1

Author

Jaroslav Krizek, Dec 26 2012

Keywords

• nonn
• base
• less

Comments

Conjecture: next terms are 1111111111111111111 and 11111111111111111111111.

Examples

			Prime 179 is a term because 197 and 719 are also prime.
Prime 1913 is not a term because 9113 is not prime (even though 1193, 1319, 1931 and 3911 are primes).
		

Crossrefs

Cf. A003459 (absolute primes).

Subsequence of A069706 (primes with property that swapping first and last digits also gives a prime).