"Sexy primes" are prime numbers that differ by six

The other day my six-year-old ask if all the numbers had been found yet. He’d just counted to fifty by himself for the first time, so I suspect he was wondering how high one could count. But what a wonderful question - and I had to tell him no, some numbers haven’t been found yet. We then had a conversation about some numbers being special - which is pretty hard to frame when you’ve talking to someone who doesn’t yet know about division, but it went pretty well.

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