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|
-- Perl Weekly Challenge 169
-- Task 1
CREATE SCHEMA IF NOT EXISTS pwc169;
CREATE OR REPLACE FUNCTION
pwc169.task1_plperl( int )
RETURNS SETOF int
AS $CODE$
my ($limit) = @_;
my $is_prime = sub {
my ($value) = @_;
for ( 2 .. $value - 1 ) {
return 0 if $value % $_ == 0;
}
return 1;
};
my $compute_factors = sub {
my ($value) = @_;
my @factors;
for ( 2 .. $value - 1 ) {
next if ! $is_prime->( $_ );
while ( $value % $_ == 0 ) {
push @factors, $_;
$value /= $_;
}
}
return @factors;
};
for ( 1 .. 9999999 ) {
my @factors = $compute_factors->( $_ );
elog( DEBUG, "Number $_ with factors " . join(',', @factors) );
next if ( @factors != 2 );
next if $factors[ 0 ] == $factors[ 1 ];
if ( length( $factors[ 0 ] ) == length( $factors[ 1 ] ) ) {
$limit--;
return_next( $_ );
}
last if ! $limit;
}
return undef;
$CODE$
LANGUAGE plperl;
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