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A084956
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Initial prime of a prime chain of length n under the iteration x->3x+4.
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6
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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.
a(11) > 8695354111. [From Donovan Johnson (donovan.johnson(AT)yahoo.com), Sep 27 2008]
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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)=3 since 3, f(3) =13 and f(13) = 43 are primes when f(x) = 3x+4
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CROSSREFS
| Cf. A057330, A057331, A083388, A084954, A084955, A084957, A084958, A084959, A084960, A084961.
Sequence in context: A062168 A019229 A135353 * A100650 A096502 A101462
Adjacent sequences: A084953 A084954 A084955 * A084957 A084958 A084959
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KEYWORD
| more,nonn
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AUTHOR
| W. Edwin Clark (eclark(AT)math.usf.edu), Jun 14 2003
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EXTENSIONS
| a(9)-a(10) from Donovan Johnson (donovan.johnson(AT)yahoo.com), Sep 27 2008
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