Search: id:A140538
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%I A140538
%S A140538 3,11,163,19,139,2593,1601,2731,1193,113,227,619,577,8537,73,43691,
%T A140538 55681,209953,307,9697,388963,52057,1091,337,260417,304651,3011,4937,
%U A140538 471521,1620001,691,5419,32491,46889,90947,25643,11057,15619,7499,7793
%N A140538 Greatest prime factor of 2*n^4+1.
%F A140538 a(n) = A006530(2n^4+1) = A076565(n^4). [From R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Aug 04 2008]
%e A140538 a(2)= 11 because 2*2^4+1 = 33 = 3*11, greatest prime factor is 11.
%Y A140538 Sequence in context: A010682 A080987 A132561 this_sequence A006485 A003115 
               A053888
%Y A140538 Adjacent sequences: A140535 A140536 A140537 this_sequence A140539 A140540 
               A140541
%K A140538 easy,nonn
%O A140538 1,1
%A A140538 Donald S. McDonald (MCDOnewt(AT)yahoo.co.nz), Jul 06 2008
%E A140538 Extended from a(16) on, R. J. Mathar (mathar(AT)strw.leidenuniv.nl), 
               Aug 04 2008

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