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A084954
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Initial prime of a prime chain of length n under the iteration x->2x+3.
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10
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2, 2, 2, 2, 47, 47, 6047, 477727, 30596497, 3388516667, 340746580567, 1763093883977, 773521306107547, 1142275515892937
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| This is a special case of prime chains generated by f(x) = cx + d.
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REFERENCES
| D. H. Lehmer, On certain chains of primes, Proc. London Math. Soc. (3) 14a 1965 183-186.
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EXAMPLE
| a(3) = 2 since 2, 2*2+3=7 and 2*7+3=17 are primes.
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CROSSREFS
| Cf. A057330, A057331, A083388, A084955, A084956, A084957, A084958, A084959, A084960, A084961, A128509, A134701, A134702.
Sequence in context: A029627 A075182 A154288 * A049300 A084957 A035307
Adjacent sequences: A084951 A084952 A084953 * A084955 A084956 A084957
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KEYWORD
| nonn,more
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AUTHOR
| W. Edwin Clark (eclark(AT)math.usf.edu), Jun 14 2003
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EXTENSIONS
| More terms from Don Reble (djr(AT)nk.ca), Nov 07 2007
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