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A198915
a(n) = 1 - 2^k + 4^k where k = 3^n.
1
3, 57, 261633, 18014398375264257, 5846006549323611672814736913013492849365380759553
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OFFSET
0,1
LINKS
Vincenzo Librandi,
Table of n, a(n) for n = 0..6
Dario A. Alpern,
Factors of Generalized Fermat Numbers
MAPLE
A198915
:=n->4^(3^n) - 2^(3^n) + 1: seq(
A198915
(n), n=0..6); #
Wesley Ivan Hurt
, May 03 2017
MATHEMATICA
Table[4^(3^n) - 2^(3^n) + 1, {n, 0, 5}]
PROG
(PARI) a(n)=1<<(2*3^n)-1<<3^n+1 \\
Charles R Greathouse IV
, Oct 31 2011
(Magma) [4^(3^n) - 2^(3^n) + 1: n in [0..7]]; //
Vincenzo Librandi
, Jun 29 2014
CROSSREFS
Cf.
A051154
.
Sequence in context:
A127263
A134723
A133060
*
A037107
A335293
A041735
Adjacent sequences:
A198912
A198913
A198914
*
A198916
A198917
A198918
KEYWORD
nonn
,
easy
AUTHOR
Artur Jasinski
, Oct 31 2011
STATUS
approved
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Last modified September 9 06:26 EDT 2024. Contains 375759 sequences. (Running on oeis4.)