Nobody has responded yet to my puzzle at the 43rd Carnival of Mathematics about what the number 43 has to do with twin primes (or rather the related concept of Chen primes).

This means either it is a harder puzzle than I expected (so nobody’s gotten it) or easier than I expected (so everyone who solved it thought it wasn’t worth posting about).

I won’t give it away but I will say the answer isn’t hard to find in the Wikipedia article on Chen primes.

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josh g., on November 13, 2008 at 2:45 pm said:Got it now. I think I missed this the first time because I was thinking of Chen primes as including all twin primes, including both the first and second number of each pair.

Claudio, on March 18, 2009 at 5:38 am said:43 is the first non Chen prime.