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What is the smallest integer n, greater than 1, such that 1/n (mod 130)  and 1/n (mod 9) are both defined?

 Jul 3, 2021
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What is the smallest integer n, greater than 1, such that
1n(mod130) and 1n(mod9)

are both defined?

 

There is an invertible modulo 130, if gcd(130 and n are relatively prime)
There is an invertible modulo 9, if (9 and n are relatively prime)

 

 

 

The smallest integer is 7

 

 

laugh

 Jul 4, 2021

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