in reply to Can't call method "forprimes"

You need to import the subroutine

use ntheory qw( forprimes );

But even then you're using it wrong. The syntax is 
forprimes { say } 100,200;              # print primes from 100 to 200
forprimes { say } 100;                  # print primes from 0 to 100

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holli

You can lead your users to water, but alas, you cannot drown them.

In Section Seekers of Perl Wisdom