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- MathMan TGLv 71 decade agoFavorite Answer
160 = 32 * 5 = 2^5 * 5.
Any number, e, which does not have 2 or 5
as factor will be relatively prime to 160,
and gcd(e, 160) = 1.
There are lots of choices: any odd number not ending in 5.
3, 37, 159, 161, 333333333, .... etc.
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