OddQ
 Usage
• OddQ[expr] gives True if expr is an odd integer, and False otherwise.
Notes
• OddQ[expr] returns False unless expr is manifestly an odd integer (i.e., has head Integer, and is odd). • You can use OddQ[x] ^= True to override the normal operation of OddQ, and effectively define x to be an odd integer. • New in Version 1.
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