Related Clues:

• Like all primes but one
• Lacking a match
• Atypical
• Quite unusual
• Unmatched, as socks
• Out of the ordinary
• Like Oscar and Felix's pairing
• Diamond pattern
• Not quite right
• Freaky
• Not even!
• Unlike this clue number
• With 44-Across, handyman's task
• Like this clue number
• "The ___ Couple"