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Search: id:A082703
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| A082703 |
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Plateau and depression primes of the form (10^a(n)-1)-8*(10^[ a(n)-1 ]+1) or (18*10^[ a(n)-1 ]-81)/9. |
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2
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OFFSET
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0,1
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COMMENT
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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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P. De Geest, PDP Reference Table
Makoto Kamada, Factorizations of 199...991.
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EXAMPLE
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a(n)=9 -> (10^9-1)-8*(10^8+1) = 199999991.
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CROSSREFS
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Cf. A082697 up to A082720.
Sequence in context: A082711 A013622 A027715 this_sequence A125708 A055289 A163550
Adjacent sequences: A082700 A082701 A082702 this_sequence A082704 A082705 A082706
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KEYWORD
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nonn,base
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AUTHOR
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Patrick De Geest (pdg(AT)worldofnumbers.com), Apr 13 2003.
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EXTENSIONS
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More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Jan 02 2008
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