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How to convert a number given in Decimal to negative base.?

For eg I want to convert $67$ given in decimal base to base $-2$.?

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    Have you seen this? http://en.wikipedia.org/wiki/Negative_base Also: http://www.wolframalpha.com/input/?i=convert+67+to+base+-22012-10-26
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    You might enjoy https://en.wikipedia.org/wiki/Quater-imaginary_base, which discusses an imaginary base system.2012-10-26
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    I've removed [tag:algebra] tag, since we don't use algebra tag anymore, see [meta](http://meta.math.stackexchange.com/questions/473/the-use-of-the-algebra-tag/3081#3081) for details2012-10-27

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