Twin primes: Difference between revisions
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Number of twin prime pairs less than 1,000,000,000 is 3,424,506 |
Number of twin prime pairs less than 1,000,000,000 is 3,424,506 |
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Number of twin prime pairs less than 10,000,000,000 is 27,412,679 |
Number of twin prime pairs less than 10,000,000,000 is 27,412,679 |
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</pre> |
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=={{header|Sidef}}== |
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<lang ruby>func twin_primes_count(upto) { |
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var count = 0 |
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var p1 = 2 |
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each_prime(3, upto, {|p2| |
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if (p2 - p1 == 2) { |
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++count |
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} |
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p1 = p2 |
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}) |
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return count |
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} |
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for n in (1..9) { |
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var count = twin_primes_count(10**n) |
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say "There are #{count} twin primes <= 10^#{n}" |
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}</lang> |
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{{out}} |
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<pre> |
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There are 2 twin primes <= 10^1 |
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There are 8 twin primes <= 10^2 |
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There are 35 twin primes <= 10^3 |
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There are 205 twin primes <= 10^4 |
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There are 1224 twin primes <= 10^5 |
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There are 8169 twin primes <= 10^6 |
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There are 58980 twin primes <= 10^7 |
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There are 440312 twin primes <= 10^8 |
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There are 3424506 twin primes <= 10^9 |
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</pre> |
</pre> |
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