Is it cheating to use inspection?

trptcolin · Oct 1, 2012 · 7c1fb44 · 7c1fb44
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+(* 2520 is the smallest number that can be divided by each of the numbers from 1
+ * to 10 without any remainder.
+ *
+ * What is the smallest positive number that is evenly divisible by all of the
+ * numbers from 1 to 20?
+ *)
+
+val answer = 19 * 17 * 13 * 11 * 7 * 5 * 3 * 2 *
+             8 (* gets to 4,8,12,16,20 *)
+             * 3 (* gets to 9,18 *);