|
%I #18 Jul 05 2017 21:17:52
%S 3,5,17,257,65537,6700417,67280421310721,5704689200685129054721,
%T 93461639715357977769163558199606896584051237541638188580280321
%N Largest prime factor of the n-th Fermat number F(n) = 2^(2^n) + 1.
%H Eric M. Schmidt, <a href="/A070592/b070592.txt">Table of n, a(n) for n = 0..11</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/FermatNumber.html">Fermat Number</a>
%o (PARI) a(n) = vecmax(factor(2^(2^n) + 1)[,1]); \\ _Michel Marcus_, Jul 05 2017
%Y Cf. A000215, A050922.
%K nonn
%O 0,1
%A _Benoit Cloitre_, May 12 2002
%E Offset changed by _Arkadiusz Wesolowski_, Jul 09 2011
| 