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%I #4 Sep 26 2014 13:26:27
%S 1,2,3,4,7,6,7,14,9,10,19,12,16,20,15,16,28,26,19,32,21,22,43,24,29,
%T 41,27,38,46,30,31,55,44,34,55,36,37,71,50,40,61,42,57,68,45,58,73,63,
%U 49,82,51,52,116,54,55,86,57,76,95,74,67,95,78,64,100,66
%N n-th positive integer relatively prime to 2*n - 1.
%C Central terms of triangle A077581.
%H Reinhard Zumkeller, <a href="/A247798/b247798.txt">Table of n, a(n) for n = 1..1000</a>
%o (Haskell)
%o a247798 n = a077581 (2 * n - 1) n
%Y Cf. A077581, A069213.
%K nonn
%O 1,2
%A _Reinhard Zumkeller_, Sep 26 2014
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