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  • Which prime numbers satisfy the expression:

    666 = p(3·3·3) + p(p(3·3·3))

    where p(i) means the ith prime number (that is, p(1) = 2, p(2) = 3, p(3) = 5, etc.)

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    • Shoot!  I copied and pasted, but forgot to replace "p(3·3·3)" with "p(i)'".  Oh, well.  Here's another one:

      Which two palindromic primes have a sum of 666?

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    • A FANDOM user
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