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Search: id:A084960
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| A084960 |
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Initial prime of a prime chain of length n under the iteration x->5x+4. |
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+0
7
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| 2, 3, 5, 83, 263, 5333, 5333, 6714497, 42360737, 3757699889, 3757699889
(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(12) > 10551875981. [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)=5 since 5, f(5) =29 and f(29) =149 are primes when f(x) = 5x+4
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CROSSREFS
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Cf. A057330, A057331, A083388, A084954, A084955, A084956, A084957, A084958, A084959, A084961.
Sequence in context: A029975 A042787 A041131 this_sequence A087543 A124121 A155011
Adjacent sequences: A084957 A084958 A084959 this_sequence A084961 A084962 A084963
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KEYWORD
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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(9) from Stefan Steinerberger (stefan.steinerberger(AT)gmail.com), May 18 2007
a(10)-a(11) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Sep 27 2008
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