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A333825 Lexicographically earliest sequence of distinct positive integers, which when mapped onto a square spiral, gives a set without three distinct aligned points. 3
1, 2, 3, 4, 17, 20, 22, 27, 45, 48, 67, 79, 80, 131, 135, 174, 180, 194, 201, 209, 236, 254, 312, 319, 394, 523, 644, 656, 706, 711, 733, 765, 766, 845, 848, 921, 922, 935, 1034, 1051, 1219, 1292, 1310, 1330, 1399, 1410, 1546, 1589, 1674, 1792, 1816, 1863 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

This sequence has similarities with A236266.

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 -20000 <= x, y <= 20000

Rémy Sigrist, C# program for A333825

EXAMPLE

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

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

| |

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

| | | |

67 * 17---*---*---*---* * *

| | | | | |

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

| | | | | | | |

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

| | | | | | |

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

| | | | |

* * *--22---*---*---*---* *

| | |

* *---*--45---*---*--48---*---*

|

*---*---*---*---*---*--79--80---*

PROG

(C#) See Links section.

CROSSREFS

See A333835 and A333866 for a similar sequences.

Cf. A174344, A236266, A274923.

Sequence in context: A333835 A178683 A111191 * A115891 A293035 A037394

Adjacent sequences: A333822 A333823 A333824 * A333826 A333827 A333828

KEYWORD

nonn

AUTHOR

Rémy Sigrist, Apr 07 2020

STATUS

approved

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Last modified December 5 12:26 EST 2022. Contains 358586 sequences. (Running on oeis4.)