Problems & Puzzles:
Prime or Composite?
Prime Curio published is
All numbers smaller than 35 + 57 + 1113
+ 1719 + 2931 + ... + 2920729209
in this form are
and this is the first such number not yet proved to be
It has 130433 digits and contains no
less than 45267907.
Let's call these
numbers to be KL(P) = Σ [p^(p+2)], where p & p+2 are prime twins; p
= 3, 5, 11, 17, 29, ..., P.
you find a factor to KL(29207)?
Solutions came from Farideh Firoozbakht, Adam Stinchcombe, Mark
Rodenkirch, Bernardo Boncompagni & Frederick Schneider.
All of them found that "151603073 is the smallest prime factor of
Mark added: "The others without factors for p< 50000 are:
others factors are available upon request"