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Search: id:A103006
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| A103006 |
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Numbers n such that 5*10^n + R_n + 6 is prime, where R_n = 11...1 is the repunit (A002275) of length n. |
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+0
2
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OFFSET
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1,2
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COMMENT
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Also numbers n such that (46*10^n+53)/9 is prime.
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LINKS
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Makoto Kamada, Factorizations of 511...117.
Index entries for primes involving repunits.
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MATHEMATICA
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Do[ If[ PrimeQ[(46*10^n + 53)/9], Print[n]], {n, 0, 10000}]
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CROSSREFS
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Sequence in context: A078959 A045345 A133986 this_sequence A053236 A118603 A033657
Adjacent sequences: A103003 A103004 A103005 this_sequence A103007 A103008 A103009
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KEYWORD
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bref,more,nonn
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AUTHOR
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Robert G. Wilson v (rgwv(AT)rgwv.com), Jan 18 2005
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EXTENSIONS
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One more PRP term from Serge Batalov (batalovs(AT)yahoo.com), Oct 13 2008
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