Initial data commit

Task/Mertens-function/Run-BASIC/mertens-function.basic

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+dim M(1000)
+M(1) = 1
+for n = 2 to 1000
+    M(n) = 1
+    for k = 2 to n
+        M(n) = M(n)-M(int(n/k))
+    next k
+next n
+print "First 99 Mertens numbers:"
+print "   ";
+for n = 1 to 99
+    print using("###", M(n));
+    if n mod 10 = 9 then print
+next n
+numCruza = 0
+numEsCero = 0
+for n = 1 to 1000
+    if M(n) = 0 then
+        numEsCero = numEsCero +1
+        if M(n-1) <> 0 then numCruza = numCruza +1
+    end if
+next n
+print
+print "M(n) is zero "; numEsCero; " times."
+print "M(n) crosses zero "; numCruza; " times."