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Primes with property that each swapping any pair of digits also gives a prime.
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%I #10 Jan 15 2013 21:55:47

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

%T 3911

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

%C Conjecture: next terms are 1111111111111111111 and 11111111111111111111111.

%e Prime 179 is a term because 197 and 719 are also prime.

%e Prime 1913 is not a term because 9113 is not prime (even though 1193, 1319, 1931 and 3911 are primes).

%Y Cf. A003459 (absolute primes).

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

%K nonn,base,less

%O 1,1

%A _Jaroslav Krizek_, Dec 26 2012