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Search: id:A082698
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| A082698 |
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Plateau and depression primes of the form 4*(10^a(n)-1)/9-3*(10^[ a(n)-1 ]+1) or (13*10^[ a(n)-1 ]-31)/9. |
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+0
3
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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 -> 4*(10^7-1)/9-3*(10^6+1) = 1444441.
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CROSSREFS
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Cf. A082697 up to A082720.
Sequence in context: A020469 A038386 A082578 this_sequence A093170 A120079 A087567
Adjacent sequences: A082695 A082696 A082697 this_sequence A082699 A082700 A082701
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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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A new PRP term from Serge Batalov (batalovs(AT)yahoo.com), Nov 02 2008
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