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a(n) = prime(4^n).
3

%I #18 Jun 06 2024 03:49:03

%S 2,7,53,311,1619,8161,38873,180503,821641,3681131,16290047,71378569,

%T 310248241,1339484197,5750079047,24563311309,104484802057,

%U 442795487221,1870358526653,7877263558621,33089240375501,138666449011757,579863159340527,2420094683001859,10082409897709157

%N a(n) = prime(4^n).

%H Amiram Eldar, <a href="/A119772/b119772.txt">Table of n, a(n) for n = 0..39</a> (calculated from the b-file at A033844; terms 0..28 from Charles R Greathouse IV, a(26) corrected)

%H Andrew Booker, <a href="https://t5k.org/nthprime/">The Nth Prime Page</a>.

%F a(n) = A033844(2*n). - _Amiram Eldar_, Jun 06 2024

%t Prime[4^Range[0,20]] (* _Harvey P. Dale_, Jul 12 2011 *)

%o (PARI) a(n)=prime(4^n) \\ _Charles R Greathouse IV_, Nov 02 2014

%Y Cf. A033844.

%K nonn,hard

%O 0,1

%A Jim Snow (jsnow(AT)mitre.org), Jun 22 2006

%E a(20)-a(24) from _Charles R Greathouse IV_, Nov 02 2014