%I A127904
%S A127904 0,1,3,5,9,17,33,65,129,257,513,1025,2049,4097,8193,16385,32769,65537,
%T A127904 131073,262145,524289,1048577,2097153,4194305,8388609,16777217,33554433,
%U A127904 67108865,134217729,268435457,536870913,1073741825,2147483649
%N A127904 Smallest m such that A008687(m) = n.
%C A127904 A008687(a(n)) = n and A008687(m) < n for m < a(n);
%C A127904 for n>1: a(n) = A000051(n-1) = 2^(n-1) + 1.
%Y A127904 Sequence in context: A074860 A135728 A083318 this_sequence A048578 A087312 
               A099170
%Y A127904 Adjacent sequences: A127901 A127902 A127903 this_sequence A127905 A127906 
               A127907
%K A127904 nonn
%O A127904 0,3
%A A127904 Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 05 2007