%I
%S 2,4,6,8,10,16,18,20,28,30,38,44,78,88,98,126,160,174,204,214,588,610,
%T 798,926,1190,1198,1806,1888,2648,3454,3510,3864,3870,8970,12330,
%U 13330,18876,22338,39718,55006,110784,172470,196434,235710,247280,268408,279320,300874,315268,372950,566496
%N Numbers n such that 2^n + 7 is prime.
%C Naturally all terms are even because (31)^(2n+1)+7 is divisible by 3.  _Bruno Berselli_, Oct 03 2012
%H Keith Conrad, <a href="https://kconrad.math.uconn.edu/blurbs/ugradnumthy/squaresandinfmanyprimes.pdf">Square patterns and infinitude of primes</a>, University of Connecticut, 2019.
%p A057195:=n>if isprime(2^n+7) then n; fi; seq(A057195(n), n=1..1000); # _Wesley Ivan Hurt_, Dec 06 2013
%t Do[ If[ PrimeQ[ 2^n +7 ], Print[n]], { n, 1, 15000 }]
%o (PARI) is(n)=isprime(2^n+7) \\ _Charles R Greathouse IV_, Feb 17 2017
%Y Cf. A104066 (primes of the form 2^n+7).
%K nonn
%O 1,1
%A _Robert G. Wilson v_, Sep 15 2000
%E a(37)a(51) from _Robert Price_, Dec 06 2013
