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A333835 Lexicographically earliest sequence of distinct positive integers, which when mapped onto a square spiral, gives a set without three distinct evenly spaced aligned points. 2
1, 2, 3, 4, 17, 18, 20, 21, 22, 24, 27, 28, 31, 33, 34, 61, 80, 81, 87, 90, 93, 100, 131, 135, 145, 146, 148, 152, 154, 157, 158, 160, 166, 171, 172, 174, 189, 194, 225, 253, 268, 270, 271, 276, 281, 282, 291, 294, 295, 298, 316, 335, 338, 368, 383, 397, 405 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

This sequence has similarities with A005836 and A229037.

LINKS

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, Scatterplot of (A174344(a(n)), A274923(a(n))) in the region -10000 <= x, y <= 10000

Rémy Sigrist, C# program for A333835

EXAMPLE

The first terms, mapped onto a square spiral, are:

*---*---*---*--61---*---*---*---*

| |

* *---*---*--34--33---*--31 *

| | | |

* * 17---*---*---*---* * *

| | | | | |

* * 18 *---4---3 * * *

| | | | | | | |

* * * * 1---2 * 28 *

| | | | | | |

* * 20 *---*---*---* 27 *

| | | | |

* * 21--22---*--24---*---* *

| | |

* *---*---*---*---*---*---*---*

|

*---*---*---*---*---*---*--80--81

PROG

(C#) See Links section.

CROSSREFS

See A333825 for a similar sequences.

Cf. A005836, A174344, A229037, A274923.

Sequence in context: A343494 A300855 A353164 * A178683 A111191 A333825

Adjacent sequences: A333832 A333833 A333834 * A333836 A333837 A333838

KEYWORD

nonn

AUTHOR

Rémy Sigrist, Apr 07 2020

STATUS

approved

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Last modified December 7 17:25 EST 2022. Contains 358668 sequences. (Running on oeis4.)