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A070592
Largest prime factor of the n-th Fermat number F(n) = 2^(2^n) + 1.
5
3, 5, 17, 257, 65537, 6700417, 67280421310721, 5704689200685129054721, 93461639715357977769163558199606896584051237541638188580280321
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OFFSET
0,1
LINKS
Eric M. Schmidt,
Table of n, a(n) for n = 0..11
Eric Weisstein's World of Mathematics,
Fermat Number
PROG
(PARI) a(n) = vecmax(factor(2^(2^n) + 1)[, 1]); \\
Michel Marcus
, Jul 05 2017
CROSSREFS
Cf.
A000215
,
A050922
.
Sequence in context:
A067387
A050922
A260476
*
A254576
A232720
A272061
Adjacent sequences:
A070589
A070590
A070591
*
A070593
A070594
A070595
KEYWORD
nonn
AUTHOR
Benoit Cloitre
, May 12 2002
EXTENSIONS
Offset changed by
Arkadiusz Wesolowski
, Jul 09 2011
STATUS
approved
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Last modified May 10 20:32 EDT 2024. Contains 372388 sequences. (Running on oeis4.)