Palindromic primes in base 16: Difference between revisions

</pre>

=={{header|Ruby}}==

<syntaxhighlight lang="ruby">res = Prime.each(500).filter_map do |pr|

str = pr.to_s(16)

str if str == str.reverse

end

puts res.join(", ")</syntaxhighlight>

{{out}}

<pre>2, 3, 5, 7, b, d, 11, 101, 151, 161, 191, 1b1, 1c1