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Search: id:A082712
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| A082712 |
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Plateau and depression primes of the form 4*(10^a(n)-1)/9+3*(10^[ a(n)-1 ]+1) or (67*10^[ a(n)-1 ]+23)/9. |
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+0
2
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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)=11 -> 4*(10^11-1)/9+3*(10^10+1) = 74444444447.
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CROSSREFS
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Cf. A082697 up to A082720.
Sequence in context: A068841 A124296 A152220 this_sequence A049090 A094622 A001604
Adjacent sequences: A082709 A082710 A082711 this_sequence A082713 A082714 A082715
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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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