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%I #12 Sep 19 2019 08:27:14
%S 54,174,550,574,588,608,678,740,740,790,798,804,874,944,986,986,994,
%T 1034,1064,1104,1104,1158,1208,1274,1308,1308,1308,1308,1406,1420,
%U 1462,1462,1462,1494,1494,1550,1580,1580,1610,1624,1638,1650,1664,1664,1664
%N Lower left-hand x-coordinates of invisible 2 X 2 squares with 0 < y < x.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/VisiblePoint.html">Visible Point</a>
%e {54, 20}, {174, 98}, {550, 114}, {574, 368}, {588, 494}, {608, 474}, ...
%Y Cf. A157426, A157427, A157429, A325602, A325603, A325604, A325605, A325606, A325607.
%K nonn
%O 1,1
%A _Eric W. Weisstein_, Mar 01 2009
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