This number is a composite.
The sum of the first non-primes less than or equal to 69 is prime. [Patterson]
100^69 - 69 is prime. Note that 69 is the smallest number with this property. [Firoozbakht]
π(6) * prime(9) = 69. [Gupta]
(There are 2 curios for this number that have not yet been approved by an editor.)
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