$ perl -E '$_=1x shift;while(/^(11+?)\1+$/){say length$1;$_=1x(length(
+)/length$1)}say length' 45
3
3
5

[download]

There you go, prime factors in increasing size. I'm sure it can be golfed down even further.

Perl 6 - second systems done right

In reply to Re: Calculate prime factors for a given number in a perl one-liner by moritz
in thread Calculate prime factors for a given numer in a perl one-liner by andmott

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