Twin primes: Difference between revisions
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(→{{header|Ruby}}: Add Ruby) |
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</pre> |
</pre> |
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=={{header|Ruby}}== |
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<lang ruby>require 'prime' |
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(1..8).each do |n| |
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count = Prime.each(10**n).each_cons(2).count{|p1, p2| p2-p1 == 2} |
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puts "Twin primes below 10**#{n}: #{count}" |
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end |
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</lang> |
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{{out}} |
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<pre>Twin primes below 10**1: 2 |
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Twin primes below 10**2: 8 |
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Twin primes below 10**3: 35 |
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Twin primes below 10**4: 205 |
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Twin primes below 10**5: 1224 |
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Twin primes below 10**6: 8169 |
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Twin primes below 10**7: 58980 |
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Twin primes below 10**8: 440312 |
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</pre> |
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=={{header|Rust}}== |
=={{header|Rust}}== |
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Limits can be specified on the command line, otherwise the twin prime counts for powers |
Limits can be specified on the command line, otherwise the twin prime counts for powers |
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