%I A077390
%S A077390 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,
%T A077390 97,127,131,137,139,151,157,173,179,223,229,233,239,331,337,421,431,
%U A077390 433
%N A077390 Primes which leave primes at every step if most significant digit and 
               least significant digit are deleted until a one digit or two digit 
               prime is obtained.
%C A077390 Is the sequence finite?
%e A077390 21313 is a member as 21313, 131 and 3 all are primes.
%Y A077390 Sequence in context: A030475 A069676 A062353 this_sequence A069677 A069678 
               A069679
%Y A077390 Adjacent sequences: A077387 A077388 A077389 this_sequence A077391 A077392 
               A077393
%K A077390 base,nonn
%O A077390 1,1
%A A077390 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 07 2002