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GIMPS has discovered a new largest known prime number: 282589933-1 (24,862,048 digits)

+ The smallest 4-digit prime p such that the sum of the predecessor and successor primes is divisible by 29. [Russo]

+ The smallest 4-digit prime such that, if its digits are ABCD, AB+CD, and A+B+C+D, they are also each prime. [Opao]

+ The smallest emirp whose additive and multiplicative persistences both equal its prime digital root. [Beedassy]

+ The smallest emirp having an emirp prime index p with reversal q such that q-th prime is also an emirp. [Beedassy]

+ Only non-titanic emirp, that is the product of a repunit number and all its truncations minus four, i.e., 111*11*1-4. [Gupta]

(There are 3 curios for this number that have not yet been approved by an editor.)




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