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A157428 Lower left-hand x-coordinates of invisible 2 X 2 squares with 0 < y < x. 15
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 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..45.

Eric Weisstein's World of Mathematics, Visible Point

EXAMPLE

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

CROSSREFS

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

Sequence in context: A250792 A044980 A248598 * A068380 A187299 A288626

Adjacent sequences:  A157425 A157426 A157427 * A157429 A157430 A157431

KEYWORD

nonn

AUTHOR

Eric W. Weisstein, Mar 01 2009

STATUS

approved

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Last modified September 26 11:29 EDT 2020. Contains 337367 sequences. (Running on oeis4.)