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A103108
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Numbers n such that 9*10^n + 8*R_n - 5 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
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1
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OFFSET
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1,1
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COMMENTS
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Also numbers n such that (89*10^n-53)/9 is prime.
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LINKS
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Table of n, a(n) for n=1..8.
Makoto Kamada, Factorizations of 988...883.
Index entries for primes involving repunits.
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MATHEMATICA
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Do[ If[ PrimeQ[(89*10^n - 53)/9], Print[n]], {n, 0, 10000}]
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CROSSREFS
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Sequence in context: A176894 A041053 A212763 * A107124 A141049 A052830
Adjacent sequences: A103105 A103106 A103107 * A103109 A103110 A103111
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KEYWORD
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more,nonn
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AUTHOR
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Robert G. Wilson v, Jan 19 2005
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EXTENSIONS
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a(8) from Kamada data by Robert Price, Dec 14 2010
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STATUS
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approved
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