Wieferich primes: Difference between revisions
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Found 2 Wieferich primes that are < 5,000
</pre>
=={{header|Ruby}}==
<lang ruby>require "prime"
puts Prime.each(5000).select{|p| 2.pow(p-1 ,p*p) == 1 }
</lang>
{{out}}
<pre>1093
3511
</pre>
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