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Search: id:A082708
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| A082708 |
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Plateau and depression primes of the form 7*(10^a(n)-1)/9-4*(10^[ a(n)-1 ]+1) or (34*10^[ a(n)-1 ]-43)/9 or 34*(10^[ a(n)-1 ]-1)/9-1. |
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+0
2
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| 3, 15, 55, 69, 85, 87, 157, 2767, 3381, 3877, 5209, 10747, 15769, 31317, 40959, 45805, 46567
(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
Makoto Kamada, Factorizations of 377...773.
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EXAMPLE
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a(n)=15 -> 7*(10^15-1)/9-4*(10^14+1) = 377777777777773.
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CROSSREFS
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Cf. A082697 up to A082720.
Sequence in context: A085480 A099581 A026696 this_sequence A093925 A119113 A152896
Adjacent sequences: A082705 A082706 A082707 this_sequence A082709 A082710 A082711
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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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