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The largest known number such that (17^n  5^n)/12 is prime. [Russo]
The smallest prime (emirp) that is separated from the smallest prime by ten iterations of the Euler phi function: 1097 > 1096 > 544 > 256 > 128 > 64 > 32 > 16 > 8 > 4 > 2. [Beedassy] The smallest balanced emirp such that its nearest primes above and below, i.e., 1091 and 1103, are also emirps. [Silva]
(There are 6 curios for this number that have not yet been approved by an editor.)
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