in reply to a close prime number
That's really easy:
sub find_closest_primes
{
my $number = shift;
my @close_primes;
for my $close (find_close_numbers( $number ))
{
push @close_primes, $close if is_prime( $close );
}
return @close_primes;
}
All you have to do is fill in the behavior of find_close_numbers() and is_prime()!
Re^2: a close prime number by belden (Friar) on Feb 11, 2005 at 21:12 UTC 
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Re^2: a close prime number by water (Deacon) on Feb 13, 2005 at 19:33 UTC 
Your solution reminds me of me of a article currently referenced from the Joel on Software homepage, which talks about the the domagichere step.
:)
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I don't necessarily think of it as magic; I didn't know what the supplicant would consider a "close" number nor did I know which prime number finding algorithm he might find acceptable.
It's not really a joke answer. It's how I would divide the problem if I were doing it.
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