|
%I #15 Apr 12 2020 13:57:57
%S 1,2,3,4,17,20,22,27,45,48,67,79,80,131,135,174,180,194,201,209,236,
%T 254,312,319,394,523,644,656,706,711,733,765,766,845,848,921,922,935,
%U 1034,1051,1219,1292,1310,1330,1399,1410,1546,1589,1674,1792,1816,1863
%N Lexicographically earliest sequence of distinct positive integers, which when mapped onto a square spiral, gives a set without three distinct aligned points.
%C This sequence has similarities with A236266.
%H Rémy Sigrist, <a href="/A333825/b333825.txt">Table of n, a(n) for n = 1..10000</a>
%H Rémy Sigrist, <a href="/A333825/a333825.png">Scatterplot of (A174344(a(n)), A274923(a(n))) in the region -20000 <= x, y <= 20000</a>
%H Rémy Sigrist, <a href="/A333825/a333825.txt">C# program for A333825</a>
%e The first terms, mapped onto a square spiral, are:
%e *---*---*---*---*---*---*---*---*
%e | |
%e * *---*---*---*---*---*---* *
%e | | | |
%e 67 * 17---*---*---*---* * *
%e | | | | | |
%e * * * *---4---3 * * *
%e | | | | | | | |
%e * * * * 1---2 * * *
%e | | | | | | |
%e * * 20 *---*---*---* 27 *
%e | | | | |
%e * * *--22---*---*---*---* *
%e | | |
%e * *---*--45---*---*--48---*---*
%e |
%e *---*---*---*---*---*--79--80---*
%o (C#) See Links section.
%Y See A333835 and A333866 for a similar sequences.
%Y Cf. A174344, A236266, A274923.
%K nonn
%O 1,2
%A _Rémy Sigrist_, Apr 07 2020
|
