This number is a prime.
Just showing those entries submitted by 'Silva':
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-101 + 9789837973716761595347434137312923191713117532 is prime. Note the descending concatenation of all primes smaller than 101. [Silva]
The sum of the first eight semiprimes. [Silva]
The sum of the first 11 non-composite numbers. Note that 11 and 101 are the first two palindromic primes. [Silva]
(There are 19 curios for this number that have not yet been approved by an editor.)
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