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A103025
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Numbers n such that 6*10^n-7 is prime.
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1
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1, 2, 5, 6, 7, 11, 17, 29, 42, 47, 96, 108, 166, 210, 331, 1022, 3593, 4426, 5704, 13936, 16486, 85910
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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COMMENTS
| Also numbers n such that 5*10^n + 9*R_n - 6 is prime, where R_n = 11...1 is the repunit (A002275) of length n.
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LINKS
| Makoto Kamada, Factorizations of 599...993.
Index entries for primes involving repunits.
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MATHEMATICA
| Do[ If[ PrimeQ[6*10^n - 7], Print[n]], {n, 0, 10000}]
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CROSSREFS
| Sequence in context: A043329 A023699 A058605 * A134080 A111300 A117548
Adjacent sequences: A103022 A103023 A103024 * A103026 A103027 A103028
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KEYWORD
| more,nonn
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AUTHOR
| Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005
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EXTENSIONS
| Addition of a(20)-a(22) from Kamada data by Robert Price (pamandbobprice(AT)yahoo.com), Dec 09 2010
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