The book is now available! 69
(another Prime Pages' Curiosity)
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Participate:
+ 1069 + 69 is prime. [Gupta]

+ s(69) = 96. [Honaker]

+ 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]

+ The smallest strobogrammatic semiprime. [Capelle]

+ Strobogrammatic primes that don't use 6 or 9 are dihedral primes.

+ pi(6) * prime(9)= 69. [Gupta]

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