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Search: id:A082697
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| A082697 |
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Plateau and depression primes of the form (10^a(n)-1)/3-2*(10^[ a(n)-1 ]+1) or (12*10^[ a(n)-1 ]-21)/9 or 4*(10^[ a(n)-1 ]-1)/3-1. |
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+0
25
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| 3, 5, 7, 95, 161, 361, 1471, 2899, 3095, 3113, 15699, 17957
(list; graph; listen)
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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 -> (10^7-1)/3-2*(10^6+1) = 1333331.
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CROSSREFS
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Cf. A082698 up to A082720.
Sequence in context: A119939 A153138 A160360 this_sequence A051345 A104388 A110337
Adjacent sequences: A082694 A082695 A082696 this_sequence A082698 A082699 A082700
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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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