Data commit

Task/Arithmetic-derivative/Python/arithmetic-derivative.py

@@ -0,0 +1,19 @@
+from sympy.ntheory import factorint
+
+def D(n):
+    if n < 0:
+        return -D(-n)
+    elif n < 2:
+        return 0
+    else:
+        fdict = factorint(n)
+        if len(fdict) == 1 and 1 in fdict: # is prime
+            return 1
+        return sum([n * e // p for p, e in fdict.items()])
+
+for n in range(-99, 101):
+    print('{:5}'.format(D(n)), end='\n' if n % 10 == 0 else '')
+
+print()
+for m in range(1, 21):
+    print('(D for 10**{}) divided by 7 is {}'.format(m, D(10 ** m) // 7))