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A102983
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Numbers n such that 4*10^n + R_n + 8 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 (37*10^n+71)/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 411...119.
Index entries for primes involving repunits.
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MATHEMATICA
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Do[ If[ PrimeQ[(37*10^n + 71)/9], Print[n]], {n, 0, 10000}]
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CROSSREFS
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Sequence in context: A128297 A183291 A216847 * A038583 A082080 A127997
Adjacent sequences: A102980 A102981 A102982 * A102984 A102985 A102986
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KEYWORD
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more,nonn
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AUTHOR
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Robert G. Wilson v, Dec 21 2004
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EXTENSIONS
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Addition of a(7)-a(8) from Kamada data by Robert Price, Dec 13 2010
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STATUS
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approved
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