Multiplicative Inverse

	Modulus 9
0  N/A
1 => 1
2 => 5
3  N/A
4 => 7
5 => 2
6  N/A
7 => 4
8 => 8
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(m - 1) - phi(m)    formula
(9 - 1) - phi(9)
(8)     - phi(9)
(8)     - 6
= 2   do not have multiplicative inverse
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4263 * 4271 = 18,207,273

(m - 1) - phi(p) * phi(q)

(18,207,273 - 1) - (4262 * 4270)

(18,207,272)     - (18,198,740)  = 8,532