99991
This number is a prime.
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The largest five-digit prime has a twin prime in 99989, an
emirp, whose sexy prime is 98993, which is also an emirp,
whose sexy prime is 39983, which also an emirp, whose
cousin prime is 39979. [Harrison]
Submitted: 2024-02-16 19:14:39; Last Modified: 2025-06-30 08:36:16.
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