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Task/Semiprime/PicoLisp/semiprime.l

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+(de factor (N)
+   (make
+      (let
+         (D 2
+            L (1 2 2 . (4 2 4 2 4 6 2 6 .))
+            M (sqrt N) )
+         (while (>= M D)
+            (if (=0 (% N D))
+               (setq M
+                  (sqrt (setq N (/ N (link D)))) )
+               (inc 'D (pop 'L)) ) )
+         (link N) ) ) )
+
+(println
+   (filter
+      '((X)
+         (let L (factor X)
+            (and (cdr L) (not (cddr L))) ) )
+      (conc (range 1 100) (range 1675 1680)) ) )
+
+(bye)