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%I #5 Aug 15 2015 20:14:18
%S 1,2,3,4,5,6,7,8,9,10,11,12,13,15,16,17,18,19,20,21,22,23,24,26,27,29,
%T 30,31,32,33,34,36,37,38,39,40,42,43,44,45,47,48,49,50,51,52,53,55,56,
%U 57,58,59,60,61,62,63,65,66,67,68,69,70,71,74,75,76,77,78,80,81,82,84
%N Root numbers n after which the absolute value of (the extremum of XiFunction[1/2+I t[n]] between t[n] and t[n+1]) decreases.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/LehmersPhenomenon.html">Lehmer's Phenomenon</a>
%e Positions t* and local extrema XiFunction[1/2+I t* ] are (15.585711332048758, -0.0008015627529657927), (22.097389559314916, 7.757611157791071*^-6), (26.263654620110252, -6.694515560853731*^-7), (31.179346409935437, 8.08323128338739*^-9), (34.16924408063743, -2.3158407239416737*^-9), (38.51676783435905, 7.095608517717453*^-11), ...
%K nonn
%O 1,2
%A _Eric W. Weisstein_, Jan 03 2006