A333825 Lexicographically earliest sequence of distinct positive integers, which when mapped onto a square spiral, gives a set without three distinct aligned points.
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
Offset: 1
Keywords
Examples
The first terms, mapped onto a square spiral, are:
*---*---*---*---*---*---*---*---*
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* *---*---*---*---*---*---* *
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67 * 17---*---*---*---* * *
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* * * *---4---3 * * *
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* * * * 1---2 * * *
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* * 20 *---*---*---* 27 *
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* * *--22---*---*---*---* *
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* *---*--45---*---*--48---*---*
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*---*---*---*---*---*--79--80---*
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
Comments