3119
This number is a prime.
The number of days between the previous terrorist attack on the World Trade Center and 9/11. Note the appearance of 911 in the reversal of 3119.
The smallest prime factor of the 43-digit number of terms required to obtain a sum of 100 in the harmonic series.
The only non-titanic prime of form n^n-6, where n is an integer, (case n=5) [Loungrides]
The smallest right-truncatable prime concatenated from two double-digit primes. [Loungrides]
(There are 3 curios for this number that have not yet been approved by an editor.)
Printed from the PrimePages <t5k.org> © G. L. Honaker and Chris K. Caldwell