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This prime is the concatenation of the Sophie Germain prime
p=23 and the corresponding safe prime 2p+1. It is the
largest such prime to have nondecreasing digits. [Hasler]
2347 and 4723 are the only primes concatenated from two doubledigit primes whose the products of digits are perfect numbers, i.e., 6, 28. [Loungrides]
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