A157426 Lower left-hand x-coordinates of invisible 1x1 squares with 0 < y < x.

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

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