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The only 5digit palindromic prime that is undulating and the sum of 3 consecutive primes (31643 + 31649 + 31657).
Note that by adding 3 consecutive primes we only get one other undulating palindrome (16161), which is a nonprime. [Trotter]
A palindromic prime that can be expressed as a sum of powers with the four prime digits as bases and exponents (2^3 + 3^2 + 5^7 + 7^5). [Silva] Replacing each digit by its square root, or subtracting 2 from each digit, you will have two other palindromic primes formed from prime digits (32323, 72727). [Silva] The largest 5digit palindromic prime whose digits are perfect squares. Coincidentally, it's the ZIP Code of Novato, California. [Silva]
(There is one curio for this number that has not yet been approved by an editor.)
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