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合成数列の和Advent Calendar 2018

Day 16

合成数列の和アドベントカレンダー Perl編

Last updated at Posted at 2018-12-16

合成数列の和アドベントカレンダー Advent Calendar 2018 の 16日目です。

ルール

  • 入力として正の整数 N を与えたら 4 から始まる 合成数 の数列の 1 番目から N 番目からの合計を出力してください
  • N は最大で 100 とします
test.pl
#!/usr/local/bin/perl
use strict;
use warnings;

use Math::Big::Factors qw(factors_wheel);

my $sum = 0;
my $sum_count = 0;
my $num = 4;
while ( 1 ) {
    my @factors = factors_wheel($num);
    if (defined($factors[1])) {
        $sum += $num;
        $sum_count++;
        last if $sum_count == $ARGV[0];
    }
    $num++;
}
print "$sum\n";

※Math::Big::Factorsを使用

出力例

$ perl test.pl 2
10
$ perl test.pl 4
27
$ perl test.pl 10
112
$ perl test.pl 100
7059
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