%I A046143
%S A046143 1,1,3,1,1,7,1,3,1,15,1,1,1,1,31,1,3,7,3,1,63,1,1,1,1,1,1,127,1,3,1,15,
%T A046143 1,3,1,255,1,1,7,1,1,7,1,1,511,1,3,1,3,31,3,1,3,1,1023,1,1,1,1,1,1,1,1,
%U A046143 1,1,2047,1,3,7,15,1,63,1,15,7,3,1,4095,1,1,1,1,1,1,1,1,1,1,1,1
%N A046143 Triangle of GCD[ 2^p-1,2^q-1 ] = 2^GCD[ p,q ]-1.
%H A046143 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               GreatestCommonDivisor.html">More information</a>
%Y A046143 Sequence in context: A102479 A053193 A010273 this_sequence A071812 A116407 
               A135288
%Y A046143 Adjacent sequences: A046140 A046141 A046142 this_sequence A046144 A046145 
               A046146
%K A046143 nonn,tabl
%O A046143 1,3
%A A046143 Eric Weisstein (eric(AT)weisstein.com)