Related Clues:

• Not matching
• A bit off
• Far from conventional
• Like all but one prime number
• Like most primes
• Sort of peculiar
• "Hmm. . ."
• Somewhat strange
• 'Huh!'
• Like 123, but not 456
• Flaky
• Like a 'Ripley's Believe It or Not!' item
• Like this clue's number
• "Hmm ..."
• Not the usual thing