3 ms·

Possibly that all the odd factors of 5040 are prime and they are all the primes less than pr equal to the largest prime divisor of 5040. Only happens for 7!

• lisper 7y ago
  > all the odd factors of 5040 are prime No, they aren't. 15, 21, 35 are all factors of 5040. In fact, any number with more than two factors will necessarily have at least one non-prime odd factor.
  • pfortuny 7y ago
    Sorry, my bad. Silly comment.