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A082705
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Plateau and depression primes of the form 2*(10^a(n)-1)/9+(10^[ a(n)-1 ]+1) or (29*10^[ a(n)-1 ]+7)/9.
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1
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OFFSET
| 0,1
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COMMENTS
| Prime versus probable prime status and proofs are given in the author's table.
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REFERENCES
| C. Caldwell and H. Dubner, "Journal of Recreational Mathematics", Volume 28, No. 1, 1996-97, pp. 1-9.
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LINKS
| P. De Geest, PDP Reference Table
Makoto Kamada, Factorizations of 322...223.
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EXAMPLE
| a(n)=9 --> 2*(10^9-1)/9+(10^8+1) = 322222223.
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CROSSREFS
| Cf. A082697 up to A082720.
Sequence in context: A012252 A027723 A046265 * A122577 A180732 A070405
Adjacent sequences: A082702 A082703 A082704 * A082706 A082707 A082708
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KEYWORD
| nonn,base
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AUTHOR
| Patrick De Geest (pdg(AT)worldofnumbers.com), Apr 13 2003.
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EXTENSIONS
| More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
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