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+.th FACTOR VI 1/15/73
+.sh NAME
+factor \*- discover prime factors of a number
+.sh SYNOPSIS
+.bd factor
+.sh DESCRIPTION
+When
+.it factor
+is invoked, it types
+out `Enter:' at you.  If you type in a positive
+number less than 2\u\s756\s0\d (about
+.if n 7.2e16)
+.if t 7.2\(mu10\u\s716\s0\d\|)
+it will repeat the number
+back at you and then its prime factors each one printed
+the proper number of times.  Then it says `Enter:' again.
+To exit, feed it an EOT or a delete.
+.s3
+Maximum time to factor is proportional to
+.if n sqrt(n)
+.if t \(sr\o'\fIn\fR\(rn'
+and occurs when
+.it n
+is prime.
+It takes 1 minute to factor a prime
+near
+10\u\s713\s0\d.
+.sh DIAGNOSTICS
+`Ouch.' for input out of range or for garbage input.
+.sh BUGS