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Search: id:A084959
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| A084959 |
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Initial prime of a prime chain of length n under the iteration x->5x+6. |
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+0
7
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| 2, 5, 7, 7, 79, 79, 345431, 21171649, 34640153, 4174239239
(list; graph; listen)
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OFFSET
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1,1
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COMMENT
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This is a special case of prime chains generated by f(x) = cx + d.
a(11) > 8695354111. [From Donovan Johnson (donovan.johnson(AT)yahoo.com), Sep 27 2008]
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REFERENCES
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D. H. Lehmer, On certain chains of primes, Proc. London Math. Soc. (3) 14a 1965 183-186.
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EXAMPLE
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a(3)=13 since 7, f(7) =41 and f(41) = 211 are primes when f(x) = 5x+6
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CROSSREFS
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Cf. A057330, A057331, A083388, A084954, A084955, A084956, A084957, A084958, A084960, A084961.
Sequence in context: A120303 A093413 A004099 this_sequence A021799 A154848 A061770
Adjacent sequences: A084956 A084957 A084958 this_sequence A084960 A084961 A084962
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KEYWORD
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more,nonn
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AUTHOR
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W. Edwin Clark (eclark(AT)math.usf.edu), Jun 14 2003
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EXTENSIONS
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a(7) corrected and a(8)-a(10) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Sep 27 2008
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