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Search: id:A082702
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| A082702 |
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Plateau and depression primes of the form 8*(10^a(n)-1)/9-7*(10^[ a(n)-1 ]+1) or (17*10^[ a(n)-1 ]-71)/9. |
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+0
2
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| 3, 9, 15, 41, 93, 129, 885, 9425, 14769, 19259, 31235
(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 188...881.
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EXAMPLE
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a(n)=15 -> 8*(10^15-1)/9-7*(10^14+1) = 188888888888881.
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CROSSREFS
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Cf. A082697-A082720.
Essentially the same as A056249+2.
Sequence in context: A013581 A133997 A057909 this_sequence A065917 A053624 A119239
Adjacent sequences: A082699 A082700 A082701 this_sequence A082703 A082704 A082705
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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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