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Replace 3^k with (-2)^k in balanced ternary expansion of n.
2

%I #2 Mar 30 2012 17:38:10

%S 1,-3,-2,-1,5,6,7,3,4,5,1,2,3,-11,-10,-9,-13,-12,-11,-15,-14,-13,-7,

%T -6,-5,-9,-8,-7,-11,-10,-9,-3,-2,-1,-5,-4,-3,-7,-6,-5,21,22,23,19,20,

%U 21,17,18,19,25,26,27,23,24,25,21,22,23,29,30,31,27,28,29,25,26,27,13,14,15,11,12,13,9,10,11,17,18,19,15

%N Replace 3^k with (-2)^k in balanced ternary expansion of n.

%C Notation: (3)< n >(2)

%e 5 = +1(9)-1(3)-1(1) -> +1(4)-1(-2)-1(1) = 5 = a(5)

%Y A065364, A065365

%K base,easy,sign

%O 1,2

%A _Marc LeBrun_, Oct 31 2001