Data update

Task/Ultra-useful-primes/Python/ultra-useful-primes.py

@@ -0,0 +1,15 @@
+# useful.py by xing216
+from gmpy2 import is_prime
+def useful(n):
+    k = 1
+    is_useful = False
+    while is_useful == False:
+        if is_prime(2**(2**n) - k):
+            is_useful = True
+            break
+        k += 2
+    return k
+if __name__ == "__main__":
+    print("n | k")
+    for i in range(1,14):
+        print(f"{i:<4}{useful(i)}")