Search: id:A084599
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%I A084599
%S A084599 2,3,5,29,79,68729,3739,6221191,157170297801581,70724343608203457341903,
%T A084599 46316297682014731387158877659877,78592684042614093322289223662773,
%U A084599 181891012640244955605725966274974474087,547275580337664165337990140111772164867508038795347198579326533639132\
               704344301831464707648235639448747816483406685904347568344407941
%N A084599 a(1) = 2, a(2) = 3; for n >= 2, a(n+1) is largest prime factor of (Product_{k=1..n} 
               a(k)) - 1.
%C A084599 Like the Euclid-Mullin sequence A000946, but subtracting rather than 
               adding 1 to the product.
%H A084599 Dario Alpern, <a href="http://www.alpertron.com.ar/ECM.HTM">ECM</a>
%e A084599 a(4)=29 since 2*3*5=30 and 29 is the largest prime factor of 30-1
%e A084599 a(5)=79 since 2*3*5*29=870 and 79 is the largest prime factor of 870-1=869=11*79.
%Y A084599 Cf. A000946, A005265, A084598.
%Y A084599 Essentially the same as A005266.
%Y A084599 Sequence in context: A084598 A038962 A019400 this_sequence A062167 A107451 
               A093490
%Y A084599 Adjacent sequences: A084596 A084597 A084598 this_sequence A084600 A084601 
               A084602
%K A084599 nonn
%O A084599 1,1
%A A084599 Marc LeBrun (mlb(AT)well.com), May 31 2003
%E A084599 More terms from Hugo Pfoertner (hugo(AT)pfoertner.org), May 31, 2003, 
               using Dario Alpern's ECM.
%E A084599 The next term a(15) is not known. It requires the factorization of the 
               245-digit composite number which remains after eliminating 7 smaller 
               factors.

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