%I A077391
%S A077391 2,11,127,1021,10313,100237
%N A077391 Smallest n-digit prime which leaves a prime at every step if most significant 
               digit and least significant digit are deleted until a one digit or 
               two digit prime is obtained, or 0 if no such prime exists.
%C A077391 Conjecture: No term is zero.
%e A077391 a(6) = 100237: this is the smallest 6-digit number such that deleting 
               MSD and LSD yields prime at every step, i.e. 100237, 0023, 02 all 
               are primes.
%Y A077391 Cf. A077390.
%Y A077391 Sequence in context: A155928 A001946 A112864 this_sequence A104087 A154596 
               A066382
%Y A077391 Adjacent sequences: A077388 A077389 A077390 this_sequence A077392 A077393 
               A077394
%K A077391 base,nonn
%O A077391 1,1
%A A077391 Amarnath Murthy (amarnath_murthy(AT)yahoo.com), Nov 07 2002