%N Start of the first occurrence of n consecutive reversible primes (emirps).
%C Palindromic primes are allowed.
%H Carlos Rivera, <a href="http://www.primepuzzles.net/problems/prob_017.htm">Problem 17. The largest known sequence of consecutive and reversible primes</a>, Problems and Puzzles.
%e 2, 3, 5, 7, 11, 13 and 17 are consecutive reversible primes, so a(7) = 2.
%Y Cf. A040104 (n=10), A048051 (n=11), A048053 (n=12), A003684, A006567, A007628, A046732, A048054, A048895.
%A _Jud McCranie_
%E Corrected by _Rick L. Shepherd_, May 28 2002
%E a(13) from _Giovanni Resta_, Nov 07 2019