De Polignac numbers: Difference between revisions
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(→{{header|Ruby}}: Better way to find pow2) |
(→{{header|Ruby}}: attribution added) |
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=={{header|Ruby}}== |
=={{header|Ruby}}== |
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Using Thundergnats observation that it is enough to subtract powers of 2 and verify that none of the results is prime. |
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<syntaxhighlight lang="ruby">require 'prime' |
<syntaxhighlight lang="ruby">require 'prime' |
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