Twin primes: Difference between revisions

=={{header|Ruby}}==

<lang ruby>require 'prime'

(1..8).each do |n|

count = Prime.each(10**n).each_cons(2).count{|p1, p2| p2-p1 == 2}

Twin primes below 10**8: 440312

</pre>

=={{header|Rust}}==

Limits can be specified on the command line, otherwise the twin prime counts for powers