Erdös-Selfridge categorization of primes: Difference between revisions

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<lang perl6>use Prime::Factor;
<lang perl6>use Prime::Factor;
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use Math::Primesieve;
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my $sieve = Math::Primesieve.new;


sub Erdös-Selfridge ($n) {
sub Erdös-Selfridge ($n) {
my @factors = prime-factors($n + 1).unique.grep: * > 3;
my @factors = unique grep * > 3, prime-factors $n + 1;
my $category = 1;
my $category = 1;
while @factors.elems {
while @factors.elems {
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$category
$category
}
}

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use Math::Primesieve;
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my $sieve = Math::Primesieve.new;


say "First 200 primes; Erdös-Selfridge categorized:";
say "First 200 primes; Erdös-Selfridge categorized:";
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my %category = $sieve.n-primes(200).categorize: { .&Erdös-Selfridge };
my %category;
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$sieve.n-primes(200).map: { %category{ Erdös-Selfridge $_ }.push: $_ }
.say for sort %category;
.say for sort %category;



say "\nFirst million primes; Erdös-Selfridge categorized:";
say "\nFirst million primes; Erdös-Selfridge categorized:";
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%category = $sieve.n-primes(1_000_000).categorize: { .&Erdös-Selfridge };
my @category;
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printf "Category %2d: first: %7d, last: %8d, total: %d\n", ++$, .[0], .[*-1], .elems for %category.sort(+*.key)».value;</lang>
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$sieve.n-primes(1_000_000).map: { @category[ Erdös-Selfridge $_ ].push: $_ }
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printf "Category %2d: first: %7d, last: %8d, total: %d\n", ++$, .[0], .[*-1], .elems for @category.grep: *.elems;</lang>
{{out}}
{{out}}
<pre>First 200 primes; Erdös-Selfridge categorized:
<pre>First 200 primes; Erdös-Selfridge categorized:
Retrieved from "https://rosettacode.org/wiki/Erdös-Selfridge_categorization_of_primes"