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%I #8 Jan 15 2017 12:03:29
%S 1,2,3,5,4,7,6,8,9,11,10,12,13,17,14,15,16,19,18,20,21,23,22,25,24,27,
%T 26,28,29,31,30,32,33,35,34,36,37,41,38,39,40,43,42,44,45,47,46,48,49,
%U 53,50,52,51,55,54,57,56,59,58,60,61,67,62,63,64,65,66,68,69,71,70,73
%N For n odd, a(n) is the least positive integer not already used. For n even, a(n) is the least positive integer not already used that is coprime to a(n/2).
%C a(4) = 5 is coprime to a(8) = 8. - _David Wasserman_, Sep 28 2004
%H Rémy Sigrist, <a href="/A082746/b082746.txt">Table of n, a(n) for n = 1..10000</a>
%o (PARI) used = vector(100); A = vector(80); least = 1; for (i = 1, 40, while (used[least], least = least + 1); A[i + i - 1] = least; used[least] = 1; m = least + 1; while (used[m] || gcd(m, A[i]) > 1, m = m + 1); A[i + i] = m; used[m] = 1); A
%K nonn
%O 1,2
%A _Amarnath Murthy_, Apr 16 2003
%E More terms from _David Wasserman_, Sep 28 2004
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