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Search: id:A082715
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| A082715 |
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Plateau and depression primes of the form 8*(10^a(n)-1)/9-(10^[ a(n)-1 ]+1) or (71*10^[ a(n)-1 ]-17)/9. |
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+0
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
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EXAMPLE
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a(n)=7 -> 8*(10^7-1)/9-(10^6+1) = 7888887.
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CROSSREFS
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Cf. A082697 up to A082720.
Sequence in context: A045974 A001531 A064118 this_sequence A041705 A137130 A058379
Adjacent sequences: A082712 A082713 A082714 this_sequence A082716 A082717 A082718
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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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