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A082710
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Numbers k such that (64*10^(k-1) + 53)/9 is a depression prime.
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0
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OFFSET
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1,1
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COMMENTS
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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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EXAMPLE
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a(1)=10907 -> (64*10^(10907-1) + 53)/9 = 7111...1117 or 10905 1's surrounded by two 7's.
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CROSSREFS
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KEYWORD
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nonn,bref,base,hard,more
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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