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577 (just those submitted by Loungrides) |
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Just showing those entries submitted by 'Loungrides': (Click here to show all) 
The larger of only two 3-digit primes that remain prime
when inserting one, two or three zeros between each digit,
i.e., 50707, 5007007, 500070007 are primes. The other such
prime is 131. [Loungrides]
(There is one curio for this number that has not yet been approved by an editor.)
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