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Search: id:A082700
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| A082700 |
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Plateau and depression primes of the form 2*(10^a(n)-1)/3-5*(10^[ a(n)-1 ]+1) or (15*10^[ a(n)-1 ]-51)/9. |
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+0
2
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| 5, 13, 17, 19, 37, 53, 73, 101, 6233, 24029, 40223
(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 166...661.
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EXAMPLE
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a(n)=13 -> 2*(10^13-1)/3-5*(10^12+1) = 1666666666661.
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CROSSREFS
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Cf. A082697 up to A082720.
Adjacent sequences: A082697 A082698 A082699 this_sequence A082701 A082702 A082703
Sequence in context: A092218 A049092 A103666 this_sequence A077425 A039955 A014539
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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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