Hello Monks. I've managed to get the following modular exercise to work, which looks at a range of integers, and provides the total of those which are not divisible by 13 or 17.

#!/usr/bin/env perl
use warnings;
use strict;
use feature ':5.10';
use File::Slurp;

my @lines = (1..2310) ; 
my @s = (13,17);
my @list1 = (0..$s[0]-1);    
my @list2 = (0..$s[1]-1);

foreach $a (@list1)
{
    my @remain1 = grep { $_% $s[0] ne $a} @lines;
        
    foreach $b (@list2)
    {
        my @remain2 = grep { $_% $s[1] ne $b} @remain1;
        say $s[0], " ", $a, " ",$s[1]," ", $b, " ", scalar @remain2;
    } 
}
[download]

# but the text below which plans to add a further prime number to the integer sequence and puts in a further nested foreach loop, does not work. It gives messages that $c is not defined.

#!/usr/bin/env perl
use warnings;
use strict;
use feature ':5.10';
use File::Slurp;

my @lines = (1..2310); 
my @s = (13,17,19);
my @list1 = (0..$s[0]-1);
my @list2 = (0..$s[1]-1);
my @list3 = (0..$s[2]-1);

foreach $a (@list1)
{
    my @remain1 = grep { $_% $s[0] ne $a} @lines;
    foreach $b (@list2)
    {
        my @remain2 = grep { $_% $s[1] ne $b} @remain1;    
        foreach $c (@list3)
        {
            my @remain3 = grep { $_% $s[2] ne $c} @remain2;
            say $s[0], " ", $a, " ",$s[1]," ", $b, " ", $s[2]," ", $c,
+ " ", scalar @remain3;
        } 
    }
}
[download]

#I'm not sure what I am doing wrong here. BTW I am totally new to perl and to programming - this is my very first perl program!

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