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%I #7 Feb 04 2020 06:35:14
%S 2,3,7,13,13,13,541,4594309,64649503,7577449963,2005324830163,
%T 39676048812109,272235769110157,494535766350049
%N Initial prime of a prime chain of length n under the iteration x->2x+5.
%C This is a special case of prime chains generated by f(x) = cx + d.
%H D. H. Lehmer, <a href="https://doi.org/10.1112/plms/s3-14A.1.183">On certain chains of primes</a>, Proc. London Math. Soc. (3) 14a 1965 183-186.
%e a(3)=7 since 7, 2*7+5=19 and 2*19+5=43 are primes.
%Y Cf. A084954.
%K nonn,more
%O 1,1
%A _W. Edwin Clark_, Jun 14 2003
%E More terms from _Don Reble_, Nov 07 2007
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