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A006035
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Numbers n such that (19^n-1)/18 is prime.
(Formerly M5072)
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12
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19, 31, 47, 59, 61, 107, 337, 1061, 9511, 22051, 209359
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OFFSET
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1,1
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COMMENTS
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No others less than 8011. - Julien Peter Benney (jpbenney(AT)ftml.net), Aug 15 2004
a(9) = 9511 was found by Richard Fischer on Dec 15 2004. - Alexander Adamchuk, Feb 11 2007
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REFERENCES
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Ribenboim, Paulo; "The Book Of Prime Number Records"; published 1989 by Springer-Verlag; pages 350-354.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
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MATHEMATICA
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PROG
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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EXTENSIONS
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One more term from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 05 2008
a(11)=209359 corresponds to a probable prime discovered by Paul Bourdelais, Aug 27 2010
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STATUS
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approved
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