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Numbers n such that n^5 + 5*n + 5^n is prime.
0

%I #8 Jun 13 2017 10:30:48

%S 1,2,3,4,6,19,23,63,76,508,561,839,894,1389,2513,3436,6121,7412,8418,

%T 9184

%N Numbers n such that n^5 + 5*n + 5^n is prime.

%t Select[Range[10000], PrimeQ[#^5 + 5*# + 5^#]&]

%o (PARI) is(n)=ispseudoprime(n^5+5*n+5^n) \\ _Charles R Greathouse IV_, Jun 13 2017

%Y Cf. A220511.

%K nonn

%O 1,2

%A _Vincenzo Librandi_, Jan 07 2013