Together with 541 form the smallest two consecutive primes, such that
the sums of the digits are equal. [Smart]
A prime (called a RL prime) obtained by concatenating the odd primes alternately on the right and left of the first prime. [Russo]
The only three-digit prime containing all three of the
first three prime digits.
[Patterson]
523! plus the 523rd prime is a titanic prime. [Gupta]
The smallest prime formed by concatenating Honaker triplets. [Loungrides]
The smallest prime that is followed immediately by 17 composite numbers. [Post]
The largest prime with a prime number of distinct prime
digits. Note that the remaining prime digit 7 when prefixed
(7523) or appended (5237) to it forms two
other primes, the reversal of whose product is also a prime
(15979393) with all of the odd digits. [Beedassy]
The only prime formed from three consecutive primes, one being the sum of the other two. [Silva]
Smallest nontrivial prime partial sum of near-repdigit
primes: 113 + 199 + 211 = 523 is prime. [Post]
Israeli grandmaster Alik Gershon played 523 chess games to break the Guinness Book World Record for the most number of simultaneous matches in October 2010. [McCranie]
The smallest prime formed from two adjacent primes with
their difference inserted between them. [Loungrides]
(There are 4 curios for this number that have not yet been approved by an editor.)
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