%I A084960
%S A084960 2,3,5,83,263,5333,5333,6714497,42360737,3757699889,3757699889
%N A084960 Initial prime of a prime chain of length n under the iteration x->5x+4.
%C A084960 This is a special case of prime chains generated by f(x) = cx + d.
%C A084960 a(12) > 10551875981. [From Donovan Johnson (donovan.johnson(AT)yahoo.com), 
               Sep 27 2008]
%D A084960 D. H. Lehmer, On certain chains of primes, Proc. London Math. Soc. (3) 
               14a 1965 183-186.
%e A084960 a(3)=5 since 5, f(5) =29 and f(29) =149 are primes when f(x) = 5x+4
%Y A084960 Cf. A057330, A057331, A083388, A084954, A084955, A084956, A084957, A084958, 
               A084959, A084961.
%Y A084960 Sequence in context: A029975 A042787 A041131 this_sequence A087543 A124121 
               A155011
%Y A084960 Adjacent sequences: A084957 A084958 A084959 this_sequence A084961 A084962 
               A084963
%K A084960 nonn
%O A084960 1,1
%A A084960 W. Edwin Clark (eclark(AT)math.usf.edu), Jun 14 2003
%E A084960 a(9) from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), May 
               18 2007
%E A084960 a(10)-a(11) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Sep 
               27 2008