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A157426 Lower left-hand x-coordinates of invisible 1x1 squares with 0 < y < x. 13
20, 35, 35, 54, 65, 69, 77, 84, 84, 95, 98, 98, 99, 99, 104, 104, 104, 110, 114, 114, 119, 119, 132, 132, 135, 135, 147, 153, 153, 159, 161, 170, 170, 170, 174, 174, 175, 185, 185, 186, 186, 188, 189, 189, 189, 189, 189, 195, 195, 195 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..50.

Eric Weisstein's World of Mathematics, Visible Point

EXAMPLE

{20, 14}, {35, 14}, {35, 20}, {54, 44}, {65, 39}, {69, 45}, {77, 21}, {84, 34}, {84, 50}, {95, 75}, ...

CROSSREFS

Cf. A157426, A157428, A157429, A325602.

Cf. A325603, A325604, A325605, A325606, A325607.

Sequence in context: A060124 A068476 A003895 * A325603 A024747 A328051

Adjacent sequences:  A157423 A157424 A157425 * A157427 A157428 A157429

KEYWORD

nonn

AUTHOR

Eric W. Weisstein, Mar 01 2009

STATUS

approved

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Last modified September 29 10:06 EDT 2020. Contains 337428 sequences. (Running on oeis4.)