

A070969


a(n) = 2^(2^n + 1) + 1.


4



5, 9, 33, 513, 131073, 8589934593, 36893488147419103233, 680564733841876926926749214863536422913, 231584178474632390847141970017375815706539969331281128078915168015826259279873
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OFFSET

0,1


LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..13


EXAMPLE

a(0)=5 because 2^(2^0 + 1) + 1 = 2^(1 + 1) + 1 = 2^2 + 1 = 4 + 1 = 5.


MATHEMATICA

2^(2^Range[0, 9] + 1) + 1 (* Vladimir Joseph Stephan Orlovsky, Jun 22 2011 *)


PROG

(MAGMA) [(2^((2^n)+1))+1: n in [0..8]]; // Vincenzo Librandi, Jun 20 2011
(PARI) a(n)=1<<(2^n+1)+1 \\ Charles R Greathouse IV, Jul 30 2011
(Maxima) A070969(n):=(2^(2^n+1))+1$ makelist(A070969(n), n, 0, 10); /* Martin Ettl, Dec 10 2012 */


CROSSREFS

Cf. A000215, A077585.
Sequence in context: A098640 A239546 A083832 * A200376 A098477 A243762
Adjacent sequences: A070966 A070967 A070968 * A070970 A070971 A070972


KEYWORD

nonn


AUTHOR

Anon, May 17 2002


EXTENSIONS

Edited by Robert G. Wilson v, May 20 2002


STATUS

approved



