Ultra useful primes: Difference between revisions
→{{header|Ruby}}: Add Ruby
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<pre>1 3 5 15 5 59 159 189 569 105
1557 2549 2439</pre>
=={{header|Ruby}}==
The 'prime?' method in Ruby's OpenSSL (standard) lib is much faster than the 'prime' lib. 0.05 sec. for this, about a minute for the next three.
<syntaxhighlight lang="ruby">require 'openssl'
(1..10).each do |n|
pow = 2 ** (2 ** n)
print "#{n}:\t"
puts (1..).step(2).detect{|k| OpenSSL::BN.new(pow-k).prime?}
end</syntaxhighlight>
{{out}}
<pre>1: 1
2: 3
3: 5
4: 15
5: 5
6: 59
7: 159
8: 189
9: 569
10: 105
</pre>
=={{header|Sidef}}==
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