A157428 Lower left-hand x-coordinates of invisible 2 X 2 squares with 0 < y < x.

54, 174, 550, 574, 588, 608, 678, 740, 740, 790, 798, 804, 874, 944, 986, 986, 994, 1034, 1064, 1104, 1104, 1158, 1208, 1274, 1308, 1308, 1308, 1308, 1406, 1420, 1462, 1462, 1462, 1494, 1494, 1550, 1580, 1580, 1610, 1624, 1638, 1650, 1664, 1664, 1664

Offset: 1

Author

Eric W. Weisstein, Mar 01 2009

Keywords

• nonn

Examples

			{54, 20}, {174, 98}, {550, 114}, {574, 368}, {588, 494}, {608, 474}, ...
		

Links

• Eric Weisstein's World of Mathematics, Visible Point

Crossrefs

Cf. A157426, A157427, A157429, A325602, A325603, A325604, A325605, A325606, A325607.