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The first prime partial sum of more than one smallest
number that contains the first n primes as substrings: 2 +
23 + 235 + 2357 = 2617 is prime. [Post]
The largest prime index of a mountain prime p in the sequence of mountain primes, i.e., p=123457897654321. [Loungrides]
(There is one curio for this number that has not yet been approved by an editor.)
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