Odd integer
An odd integer 
is an integer which is not a multiple of 
(or equivalently one more than a multiple of ). The odd integers are 
Every odd integer can be written in the form 
for some unique other integer 
.
The product of any two odd integers is odd, but the sum and difference of any two odd integers are even.
The sum and difference of an even integer and odd integer are odd. Besides 
all prime numbers are odd.
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