Ultra useful primes: Difference between revisions
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Line 426:
<pre>1 3 5 15 5 59 159 189 569 105
1557 2549 2439</pre>
=={{header|Python}}==
<syntaxhighlight lang="python>
# 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)}")
</syntaxhighlight>
{{out}}
<pre>
n | K
1 1
2 3
3 5
4 15
5 5
6 59
7 159
8 189
9 569
10 105
11 1557
12 2549
13 2439
</pre>
=={{header|Ring}}==
<syntaxhighlight lang="ring">
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