%I A046268
%S A046268 0,2,0,0,0,3,0,2,5,5,2,2,409,19,163,7,6553,131,2621,5,857,971,419,83,
%T A046268 1677721,5443,71,1342177,43,709,107,83,4294967,89,171798691,3597383,
%U A046268 6871947673,3743895347,779069,54975581,511627,99023,4398046511,79609
%N A046268 Largest prime substring in 2^n (0 if none).
%e A046268 2^37 = 1{3743895347}2.
%Y A046268 Cf. A046260.
%Y A046268 Sequence in context: A143655 A076849 A083059 this_sequence A113503 A082507 
               A132349
%Y A046268 Adjacent sequences: A046265 A046266 A046267 this_sequence A046269 A046270 
               A046271
%K A046268 nonn
%O A046268 0,2
%A A046268 Patrick De Geest (pdg(AT)worldofnumbers.com), Jun 15 1998.