From mboxrd@z Thu Jan  1 00:00:00 1970
From: reed@reedmedia.net (Jeremy C. Reed)
Date: Tue, 21 Jul 2015 22:16:15 -0500 (CDT)
Subject: [TUHS] /usr/games/factor
In-Reply-To: <alpine.BSF.2.11.1507221256040.20306@aneurin.horsfall.org>
References: <alpine.BSF.2.11.1507221256040.20306@aneurin.horsfall.org>
Message-ID: <alpine.NEB.2.11.1507212212430.27911@t1.m.reedmedia.net>

> I recall playing with this on the -11, but it seems to have become extinct 
> (the program, I mean).  I seem to recall that it was written in PDP-11 
> assembly; did it ever get rewritten in C?

Looks like rewritten at least twice (1983 and 1990):
http://svnweb.freebsd.org/csrg/games/factor/

Also a maintained version
http://cvsweb.netbsd.org/bsdweb.cgi/src/games/factor/