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A082711
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Plateau and depression primes of the form 2*(10^a(n)-1)/9+5*(10^[ a(n)-1 ]+1) or (65*10^[ a(n)-1 ]+43)/9.
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1
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3, 5, 9, 29, 65, 725, 1787, 7277, 19463, 24215, 51779
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OFFSET
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1,1
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COMMENTS
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Prime versus probable prime status and proofs are given in the author's table.
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REFERENCES
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C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.
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LINKS
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Table of n, a(n) for n=1..11.
P. De Geest, PDP Reference Table - 727
Makoto Kamada, Factorizations of 722...227.
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EXAMPLE
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a(n)=9 -> 2*(10^9-1)/9+5*(10^8+1) = 722222227.
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CROSSREFS
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Cf. A082697 up to A082720.
Sequence in context: A192152 A217098 A209286 * A013622 A027715 A082703
Adjacent sequences: A082708 A082709 A082710 * A082712 A082713 A082714
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KEYWORD
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nonn,base
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AUTHOR
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Patrick De Geest, Apr 13 2003.
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EXTENSIONS
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Update from De Geest site by Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
a(11)=51779 from Ray Chandler, Nov 16 2010
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STATUS
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approved
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