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%I #8 Feb 03 2020 15:25:08
%S 0,1,10,11,100,1000,1001,1010,1011,1100,1101,1110,1111,-1,-1,-1,10000,
%T 10001,10010,10011,10100,11000,11001,11010,11011,11100,11101,11110,
%U 11111,-1,-1,-1,100000,100001,100010,100011,100100,101000,101001,101010,101011,101100,101101,101110,101111,-1,-1,-1
%N Binary string which equals n when 1's, 2's, 4's and 8's bits have weights 1, 2, 4, 5 respectively, while the other bits have their usual weights. -1 if no such string exists.
%C There are engineering reasons for this encoding, but it is unsatisfactory from a mathematical point of view since 5 could equally well be 101.
%D John M. Yarbrough, Digital Logic Applications and Design, West Publishing, 1997, p. 26
%Y Cf. A066335, A066338.
%K sign,base
%O 0,3
%A _George E. Antoniou_, Dec 15 2001
%E More terms from _Joshua Zucker_, Jun 21 2006
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