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 A084954 Initial prime of a prime chain of length n under the iteration x->2x+3. 10
 2, 2, 2, 2, 47, 47, 6047, 477727, 30596497, 3388516667, 340746580567, 1763093883977, 773521306107547, 1142275515892937 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS This is a special case of prime chains generated by f(x) = cx + d. Is it smallest initial prime of a prime chain of length n under the iteration x->2x+3, or not?  At least up to 3388516667 it is the smallest one. - Zak Seidov, Dec 20 2013 LINKS D. H. Lehmer, On certain chains of primes, Proc. London Math. Soc. (3) 14a 1965 183-186. EXAMPLE a(3) = 2 since 2, 2*2+3=7 and 2*7+3=17 are primes. CROSSREFS Cf. A057330, A057331, A083388, A084955, A084956, A084957, A084958, A084959, A084960, A084961, A128509, A134701, A134702. Sequence in context: A289087 A154288 A225057 * A226281 A217993 A049300 Adjacent sequences:  A084951 A084952 A084953 * A084955 A084956 A084957 KEYWORD nonn,more AUTHOR W. Edwin Clark, Jun 14 2003 EXTENSIONS More terms from Don Reble, Nov 07 2007 STATUS approved

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Last modified May 19 17:48 EDT 2019. Contains 323395 sequences. (Running on oeis4.)