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A301369 Numbers n such that (9^n + 7^n)/16 is prime. 0

%I

%S 3,107,197,2843,3571,4451

%N Numbers n such that (9^n + 7^n)/16 is prime.

%C All terms are prime.

%C The corresponding primes are 67, 79401467172644850007356716446663549450843749853576087044440771380676673442288169290888310265443988907, ...

%p select(n->isprime((9^n+7^n)/16),[seq(n,n=1..10000,2)]); # _Muniru A Asiru_, Mar 27 2018

%t Select[Range[1, 10000], PrimeQ[(9^n+7^n)/16] &]

%o (PARI) forprime(n=3, 10000, if(isprime((9^n+7^n)/16), print1(n, ", ")))

%o (MAGMA) [n: n in [1..10000] |IsPrime((9^n+7^n)/16)]

%Y Cf. A057175, A125956, A211409, A128339, A187819.

%K nonn,more,hard

%O 1,1

%A _Tim Johannes Ohrtmann_, Mar 19 2018

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Last modified June 19 19:11 EDT 2019. Contains 324222 sequences. (Running on oeis4.)